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  • AIRCRAFT PROPULSION AND POWER  (1,219)
  • Waves
  • 1975-1979  (1,232)
  • 1950-1954  (20)
  • 1935-1939  (7)
  • 1925-1929
Collection
Keywords
Publisher
Years
Year
  • 1
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    Pulse distortion and Hilbert transformation in multiply reflected and refracted body waves (1975)
    In:  Bull. Seism. Soc. Am., Taipei, Elsevier, vol. 65, no. 1, pp. 55-70, pp. TC1002, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1975
    Keywords: Seismology ; Waves ; caustics ; Synthetic seismograms ; Hilbert transform ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    On seismic waves (second paper) (1935)
    In:  Gerlands Beiträge zur Geophysik, Milano, Gustav Fischer, vol. 45, no. 3, pp. 280-360, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1935
    Keywords: Waves ; Seismology ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    On seismic waves (third paper) (1936)
    In:  Gerlands Beiträge zur Geophysik, Milano, Gustav Fischer, vol. 47, no. 3, pp. 73-131, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1936
    Keywords: Waves ; Seismology ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Wave velocities in the earth's crustal layers (1950)
    In:  Geophysics, Milano, California Institute of Technology Pasadena, vol. 15, no. 6, pp. 156, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1950
    Keywords: Waves ; Velocity analysis ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Travel times of waves from artificial explosions (1951)
    In:  Bull. Geol. Soc. Am., Milano, California Institute of Technology Pasadena, vol. 62, no. 6, pp. 1528, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1951
    Keywords: Travel time ; Waves ; Nuclear explosion
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Waves from blasts recorded in Southern California (1952)
    In:  Trans., Am. Geophys. Union, Milano, California Institute of Technology Pasadena, vol. 33, no. 6, pp. 427-431, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1952
    Keywords: Waves ; Seismometer ; Seismology ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    SV and SH (1952)
    In:  Trans., Am. Geophys. Union, Milano, California Institute of Technology Pasadena, vol. 33, no. 6, pp. 573-584, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1952
    Keywords: Waves ; SV waves ; Shear waves ; Seismology ; SH waves ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    Surface motion in SV and SH (1952)
    In:  Bull. Geol. Soc. Am., Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 63, no. 6, pp. 1353, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1952
    Keywords: Surface waves ; Waves ; Seismology ; Shear waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 9
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    PKKP, P'P', and the earth's core (1951)
    In:  Trans., Am. Geophys. Union, Milano, California Institute of Technology Pasadena, vol. 32, no. 6, pp. 373-390, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1951
    Keywords: Waves ; earth Core ; Seismology ; P-waves ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 10
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    Solution of the inverse problem for wave propagation using J-fraction expansion (1977)
    In:  Geophys. J. R. astr. Soc., Berlin, Ges. f. Geowissenschaften e.V., vol. 51, no. B7, pp. 545-554, pp. B03308, (ISSN 0343-5164)
    Details
    Publication Date: 1977
    Keywords: Inversion ; Waves ; HPH ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 11
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    Study of the attenuation and azimuthal dependence of seismic wave propagation in the southeastern United States (1977)
    In:  Bull. Seism. Soc. Am., Berlin, Schweizerbart'sche Verlagsbuchhandlung, vol. 67, no. 7, pp. 1503-1513, pp. L14306, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1977
    Keywords: Seismology ; Waves ; Attenuation ; Anisotropy ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 12
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    The dynamic field of Haskell's rectangular dislocation fault model (1978)
    In:  Bull. Seism. Soc. Am., San Francisco, Pergamon, vol. 68, no. 5496, pp. 869-887, pp. B05315, (ISSN: 1340-4202)
    Details
    Publication Date: 1978
    Keywords: SModelling ; Waves ; Dislocation ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 13
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    Seismic waves due to a shear fault in a semi-infinite medium, II. Moving source (1975)
    In:  J. Phys. Earth, Amsterdam, Univ. Tokyo, vol. 23, no. 1, pp. 43-61, pp. L14309, (ISSN: 1340-4202)
    Details
    Publication Date: 1975
    Keywords: Waves ; Source ; JPE
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    BIBLIOGRAPHY SEISMOLOGY
  • 14
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    Reflectivity method for buried sources (1978)
    In:  J. Geophys., Würzburg, Physica-Verlag, vol. 44, no. 1, pp. 603-612, pp. L24313, (ISSN: 1340-4202)
    Details
    Publication Date: 1978
    Keywords: Waves ; Reflection seismics ; Reflectivity method
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    BIBLIOGRAPHY SEISMOLOGY
  • 15
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    Extensions of the reflectivity method (1979)
    In:  J. Geophys., Würzburg, Physica-Verlag, vol. 45, no. 1, pp. 373-380, pp. L24313, (ISSN: 1340-4202)
    Details
    Publication Date: 1979
    Keywords: Reflection seismics ; Seismics (controlled source seismology) ; Waves ; Reflectivity method
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    BIBLIOGRAPHY SEISMOLOGY
  • 16
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    Die Entstehung der anomalen Schallzonen bei Explosionen (1926)
    In:  Zeitschrift für Geophysik, Jena, Gustav Fischer, vol. 2, no. 3, pp. 260-266, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Waves ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 17
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    Über die Ausbreitung des Schalls in der Atmosphäre (1926)
    In:  Die Naturwissenschaften, Jena, Gustav Fischer, vol. 14, no. 3, pp. 338-342, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1926
    Keywords: Waves ; Meteorology ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 18
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    Seismic waves in the core of the earth (1938)
    In:  Nature, Milano, Gustav Fischer, vol. 141, no. 6, pp. 371, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1938
    Keywords: Waves ; Seismology ; earth Core
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    BIBLIOGRAPHY SEISMOLOGY
  • 19
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    P' and the earth's core (1938)
    In:  Month. Notices Royal astr. Soc., Geophys. Suppl., Milano, Gustav Fischer, vol. 4, no. 6, pp. 363-372, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1938
    Keywords: Waves ; earth Core ; P-waves ; Diffraction
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    BIBLIOGRAPHY SEISMOLOGY
  • 20
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    The dispersion of surface waves on multilayered media (1953)
    In:  Bull. Seism. Soc. Am., Oxford and Edinburgh, Blackwell Scientific Publications, vol. 43, no. 11, pp. 17-34, pp. L23301, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1953
    Keywords: Surface waves ; Dispersion ; Layers ; Waves ; Modelling ; Synthetic seismograms ; BSSA ; FROTH ; HPH
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    BIBLIOGRAPHY SEISMOLOGY
  • 21
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    On the theory of head waves (1953)
    In:  Geophys., Oxford and Edinburgh, Blackwell Scientific Publications, vol. 18, no. 5, pp. 871-893, pp. B09408, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1953
    Keywords: Waves ; Refraction seismics ; Head waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 22
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    The spectral function of a layered system and the determination of the waveform at depth (1977)
    In:  Geophys. Prospecting, Oslo, Wiley, vol. 25, no. 3, pp. 434-459, pp. B08303, (ISSN: 1340-4202)
    Details
    Publication Date: 1977
    Keywords: Goupillaud model ; Spectrum ; Layers ; Waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 23
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    Transmission of elastic waves through a stratified medium (1950)
    In:  J. appl. Phys., London, AGU, vol. 21, no. 2, pp. 89-93, pp. L10304, (ISSN: 1340-4202)
    Details
    Publication Date: 1950
    Keywords: Wavelet processing ; Layers ; Waves ; Modelling ; Thomson-Haskell ; Synthetic seismograms
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    BIBLIOGRAPHY SEISMOLOGY
  • 24
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    Near-field particle motion resulting from a propagating stress-relaxation over a fault embedded within a layered medium (1977)
    In:  Eos, Trans., Am. Geophys. Union, Amsterdam, Elsevier Scientific Publishing Company, vol. 58, no. 12, pp. 445, pp. 1390
    Details
    Publication Date: 1977
    Keywords: Nearfield ; Fault zone ; Layers ; Stress ; Waves ; Conference abstr.
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    BIBLIOGRAPHY SEISMOLOGY
  • 25
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    Waves and currents recorded by electromagnetic barographs (1939)
    In:  Bull. Am. Meteor. Soc., Beijing, Pergamon, vol. 20, no. 3-4, pp. 421-426, pp. 1246
    Details
    Publication Date: 1939
    Keywords: Waves ; Electromagnetic methods/phenomena ; Instruments ; Meteorology
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    BIBLIOGRAPHY SEISMOLOGY
  • 26
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    Theoretical seismograms of core phases calculated by frequency-dependent full wave theory and their interpretation (1977)
    In:  Geophys. J. R. astr. Soc., Taipei, Elsevier, vol. 51, no. 1, pp. 275-312, pp. TC1002, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1977
    Keywords: Seismology ; Waves ; caustics ; Synthetic seismograms ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 27
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    Representation of random waveforms by relational trees (1976)
    In:  IEEE Transactions on Computers, Luxembourg, Am. Soc. Mech. Eng., vol. C-25, no. 1, pp. 725-736, pp. L12311, (ISBN 0-471-26610-8)
    Details
    Publication Date: 1976
    Keywords: Waves ; Statistical investigations
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    BIBLIOGRAPHY SEISMOLOGY
  • 28
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    Microseisms, microbaroms, storms and waves in western North America (1953)
    In:  Trans., Am. Geophys. Union, Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 34, no. 6, pp. 161-173, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1953
    Keywords: Micro seismicity ; Waves ; Seismology ; Meteorology ; NOISE ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 29
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    On seismic waves (fourth paper) (1939)
    In:  Gerlands Beiträge zur Geophysik, Milano, Gustav Fischer, vol. 54, no. 6, pp. 94-136, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1939
    Keywords: Waves ; Seismology ; Review article
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    BIBLIOGRAPHY SEISMOLOGY
  • 30
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    Quantenmechanik der Stoßvorgänge (1926)
    In:  Zeitschrift für Physik, Leipzig, Birkhäuser Verlag, vol. 38, no. 5, pp. 803, pp. L15S17, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1926
    Keywords: physics ; Scattering ; Waves ; quantum ; mechanics
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    BIBLIOGRAPHY SEISMOLOGY
  • 31
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    Discrete wave-number representation of seismic-source wave fields (1977)
    In:  Bull. Seism. Soc. Am., Leipzig, Birkhäuser Verlag, vol. 67, no. 6, pp. 259-277, pp. 2366, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1977
    Keywords: Waves ; Wave number analys. ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 32
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    Discrete wave number representation of elastic wave fields in three-space dimensions (1979)
    In:  J. Geophys. Res., Leipzig, Birkhäuser Verlag, vol. 84, no. 6, pp. 3609-3614, pp. 2366, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1979
    Keywords: Waves ; Wave number analys. ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 33
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    Velocity inversion procedure for acoustic waves (1979)
    In:  Geophysics, Heidelberg, 3-4, vol. 44, no. 4, pp. 1077-1087, pp. 1516, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1979
    Keywords: Seismics (controlled source seismology) ; Inversion ; Waves ; Acoustics
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    BIBLIOGRAPHY SEISMOLOGY
  • 34
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    Über Fortpflanzung von elastischen Wellen in viskosen Medien (1929)
    In:  Physikalische Zeitschrift, Milano, Gustav Fischer, vol. 30, no. 3, pp. 230-231, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1929
    Keywords: Seismology ; Elasticity ; Waves ; Inelastic ; Fluids
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    BIBLIOGRAPHY SEISMOLOGY
  • 35
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    Erdbeben und Erdbebenwellen (1927)
    J. A. Barth
    In:  Professional Paper, Handbuch der physikalischen und technischen Mechanik, Bd. III, Leipzig, J. A. Barth, vol. 3, no. VIIa, pp. 387-420, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1927
    Keywords: Seismology ; Seismicity ; Waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 36
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    Erdbebenwellen (1952)
    Springer
    In:  Professional Paper, Landolt Börnstein (6. Edition) III. Band: Astronomie und Geophysik, Berlin, Springer, vol. 7, no. XVI:, pp. 375-384, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1952
    Keywords: Seismology ; Waves
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    BIBLIOGRAPHY SEISMOLOGY
  • 37
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    Study of the seismic waves SKS and SKKS (1954)
    In:  Bull. Seism. Soc. Am., Tokyo, Railway Tech. Res. Inst., vol. 44, no. 4, pp. 39-56, pp. L06615, (ISSN: 1340-4202)
    Details
    Publication Date: 1954
    Keywords: Waves ; Seismology ; earth Core ; Travel time ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 38
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    Reflexion et Refraction des Ondes Seismiques Progressives (1939)
    Gauthier-Villars
    In:  Paris, Gauthier-Villars, vol. 3, no. 3, pp. 275-291, (ISBN 0-415-24328-9 (hb), 0-203-47128-8 (pb))
    Details
    Publication Date: 1939
    Keywords: Waves ; Refraction seismics ; Reflection seismics
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    BIBLIOGRAPHY SEISMOLOGY
  • 39
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    Theorie der Erdbebenwellen (1929)
    Bornträger
    In:  Professional Paper, Handbuch der Geophysik, Volume 4: Erdbeben (finished), 12 + 1202 S., Berlin, Bornträger, vol. 3, no. VIIa, pp. 1-150, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1929
    Keywords: Review article ; Seismology ; Waves ; Wave propagation
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    BIBLIOGRAPHY SEISMOLOGY
  • 40
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    Asymptotic results for elastodynamic propagator matrices in plane-stratified and spherically-stratified Earth models (1978)
    In:  Geophys. J. R. astr. Soc., Köln, Elsevier, vol. 54, no. 4, pp. 263-280, pp. 1015, (ISSN: 1340-4202)
    Details
    Publication Date: 1978
    Keywords: Waves ; Wave propagation ; Layers ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 41
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    Wasserwellen und Gezeiten (1926)
    Bornträger
    In:  Professional Paper, Lehrbuch der Geophysik, Berlin, 6 + 1017 pp., Bornträger, vol. 3, no. VIIa, pp. 308-353, (ISBN: 3-540-23712-7)
    Details
    Publication Date: 1926
    Keywords: Waves ; TIDES
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    BIBLIOGRAPHY SEISMOLOGY
  • 42
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    Wavelet processing (1978)
    In:  Seventh Annual IPA Convention, Atlanta, Soc. Explorat. Geophys., vol. C 560, 183 pp., no. 8, pp. 480-482, (ISBN 3-933346-037)
    Details
    Publication Date: 1978
    Keywords: Waves ; Seismology ; Wavelet processing
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    BIBLIOGRAPHY SEISMOLOGY
  • 43
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    Elastic waves: P and S conversations in first arriving reflection and critical refractions (1976)
    Colorado School of Mines
    In:  Ph.D. Thesis No. T 1784, Golden, Colorado School of Mines, vol. 10, no. No. 31, pp. V1-V12, (ISBN 0 08 042822 3)
    Details
    Publication Date: 1976
    Keywords: Waves ; ConvolutionR ; Reflection seismics ; Refraction seismics ; First arrival
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    BIBLIOGRAPHY SEISMOLOGY
  • 44
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    Theoretische Betrachtungen zur Absorption elastischer Wellen in Festkörpern (1976)
    Fachbereich Physik der Johann Wolfgang von Goethe-Universität Frankfurt am Main
    In:  Dissertation, Munich, Fachbereich Physik der Johann Wolfgang von Goethe-Universität Frankfurt am Main, vol. 10, no. 47, pp. 15/1-15/21
    Details
    Publication Date: 1976
    Keywords: Absorption ; Elasticity ; Waves ; Wave propagation
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    BIBLIOGRAPHY SEISMOLOGY
  • 45
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    Aircraft Energy Efficiency (ACEE) status report (1979)
    In:  CASI
    Details
    Publication Date: 2009-11-17
    Description: Fuel efficiency in aeronautics, for fuel conservation in general as well as for its effect on commercial aircraft operating economics is considered. Projects of the Aircraft Energy Efficiency Program related to propulsion are emphasized. These include: (1) engine component improvement, directed at performance improvement and engine diagnostics for prolonged service life; (2) energy efficient engine, directed at proving the technology base for the next generation of turbofan engines; and (3) advanced turboprop, directed at advancing the technology of turboprop powered aircraft to a point suitable for commercial airline service. Progress in these technology areas is reported.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 1-58
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    NASA TECHNICAL REPORTS
  • 46
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    High-performance-vehicle technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Propulsion needs of high performance military aircraft are discussed. Inlet performance, nozzle performance and cooling, and afterburner performance are covered. It is concluded that nonaxisymmetric nozzles provide cleaner external lines and enhanced maneuverability, but the internal flows are more complex. Swirl afterburners show promise for enhanced performance in the high altitude, low Mach number region.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 445-462
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    NASA TECHNICAL REPORTS
  • 47
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    Vertical Takeoff and Landing (VTOL) propulsion technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Propulsion problems and advanced technology requirements of VTOL aircraft are discussed. Specific topics covered include inlets with high angle of attack capability, rapid thrust modulation fans, and propulsion-system/aircraft-control integration.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 409-444
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    NASA TECHNICAL REPORTS
  • 48
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    Hypersonic propulsion (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Research on hydrogen fueled scramjet engines for hypersonic flight is reviewed. Component developments, computational methods, and preliminary ground tests of subscale scramjet engine modules at Mach 4 and 7 are emphasized. Airframe integration, structures, and flow diagnostics are also discussed. It is shown that mixed-mode perpendicular and parallel fuel injection controls heat release over a wide Mach range and the fixed geometry inlet gives good performance over a wide range of Mach numbers.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 387-408
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    NASA TECHNICAL REPORTS
  • 49
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    Control technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: An overview of engine control technology is presented with emphasis on gas turbine engine controls. The role of the government, and NASA in particular, in advancing this technology is discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 329-344
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    NASA TECHNICAL REPORTS
  • 50
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    Supersonic propulsion technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Propulsion concepts for commercial supersonic transports are discussed. It is concluded that variable cycle engines, together with advanced supersonic inlets and low noise coannular nozzles, provide good operating performance for both supersonic and subsonic flight. In addition, they are reasonably quiet during takeoff and landing and have acceptable exhaust emissions.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 345-386
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    Mechanical components (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Research on bearings, gears, seals, and rotor dynamics (specifically high speed balancing and dampers) is presented. The research pertains to problems in both aircraft turbine engines and helicopter transmissions.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 273-308
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  • 52
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    Instrumentation technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Some of the efforts made in applying technologically new tools to today's propulsion measurement problems are described. They include: (1) a blade-tip clearance system; (2) a pulsed thermocouple system used to measure gas temperature with a thermocouple at temperatures above the melting point of the thermocouple; (3) an optical technique for measuring blade flutter; (4) a probe for dynamic flow and flow angle measurement; and (5) a laser anemometer system for rapidly mapping the flow profiles between the blades of a rotating compressor.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 309-328
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  • 53
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    Turbomachinery technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: A technology assessment of turbomachinery is presented. The design of the fan, compressor, and turbine components for future advanced aircraft engines is discussed. Basic flow characteristics in compressors and turbines and the heat transfer phenomena in cooled turbines are also discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 231-272
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  • 54
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    Computational fluid mechanics of internal flow (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Major solution techniques for internal computational fluid mechanics are discussed and some examples are presented. The major steps involved in developing a large computer code are then discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 187-230
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  • 55
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    Alternative jet aircraft fuels (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Potential changes in jet aircraft fuel specifications due to shifts in supply and quality of refinery feedstocks are discussed with emphasis on the effects these changes would have on the performance and durability of aircraft engines and fuel systems. Combustion characteristics, fuel thermal stability, and fuel pumpability at low temperature are among the factors considered. Combustor and fuel system technology needs for broad specification fuels are reviewed including prevention of fuel system fouling and fuel system technology for fuels with higher freezing points.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 129-148
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  • 56
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    Materials and structures technology (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Materials and structures performance limitations, particularly for the hot section of the engine in which these limitations limit the life of components, are considered. Failure modes for components such as blades, vanes, and combustors and how they are affected by the environment for such components are discussed. Methods used to improve the materials used for such components are: (1) application of directional structures to turbine components for high strength at high temperatures; (2) improved coatings to increase oxidation and corrosion resistance; (3) increase strength and stiffness with reduced weight by applying higher specific properties of composite materials; and (4) cost effective processing such as near net shape powder methods applied to disks. Life prediction techniques developed to predict component life accurately in advance of service and progress in improving the intermediate and cold section components of turbine engines are covered.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 149-186
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  • 57
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    Noise reduction (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: The turbofan engine's noise-producing components are discussed in terms of efficient and economical noise reduction techniques that do not penalize the engine performance or weight significantly. Specific topics covered include fan noise, acoustic suppression, jet noise technology, combustor noise, and aircraft noise prediction.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 85-128
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  • 58
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    Emission reduction (1979)
    In:  CASI
    Details
    Publication Date: 2006-07-16
    Description: Control of the gaseous pollutant emissions of aircraft engines is considered in terms of the emission standards for six classes of aircraft engines. Emphasis is placed on combustor design concepts to significantly reduce emissions levels and lean-burning techniques to lower flame temperature, to reduce the oxides of nitrogen in the gaseous emissions.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeropropulsion 1979; p 59-84
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  • 59
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    Optimal control of a supersonic inlet to minimize frequency of inlet unstart (1978)
    In:  CASI
    Details
    Publication Date: 2006-03-02
    Description: A preliminary investigation into the use of modern control theory for the design of controls for a supersonic inlet is described. In particular, the task of controlling a mixed-compression supersonic inlet is formulated as a linear optimal stochastic control and estimation problem. An inlet can exhibit an undesirable instability due to excessive inlet normal shock motion. For the optimal control formulation of the inlet problem, a non quadratic performance index, which is equal to the expected frequency of inlet unstarts, is used. This physically meaningful performance index is minimized for a range of inlet disturbance and measurement noise covariances.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA, Washington Fourth Inter-Center Control Systems Conf.; p 323-335
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  • 60
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    Aircraft engines (1977)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Thrust and weight requirements of aircraft engines in general are discussed. The characteristics and operating principles of various types of air breathing and rocket engines are described.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Soviet Aircraft and Rockets (NASA-TT-F-770); p 81-139
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  • 61
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    Trends in aircraft noise control (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: Flight vehicles are characterized according to their manner of operation and type of propulsion system; and their associated sources of noise are identified. Available noise reduction technology as it relates to engine cycle design and to powerplant component design is summarized. Such components as exhaust jets, fans, propellers, rotors, blown flaps, and reciprocating-engine exhausts are discussed, along with their noise reduction potentials. Significant aircraft noise reductions are noted to have been accomplished by the application of available technology in support of noise certification rules. Further noise reductions to meet more stringent future noise regulations will require substantial additional technology developments. Improved analytical prediction methods, and well-controlled validation experiments supported by advanced-design aeroacoustic facilities, are required as a basis for an effective integrated systems approach to aircraft noise control.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA/Univ. Conf. on Aeron.; p 103-130
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  • 62
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    Normal shock and restart controls for a supersonic airbreathing propulsion system (1978)
    In:  CASI
    Details
    Publication Date: 2006-02-28
    Description: Results of experimental investigations to control a supersonic mixed-compression inlet coupled to a turbojet engine are presented. Special instrumentation and servoactuators were developed to have sufficiently fast dynamic response so that basic propulsion system dynamics were the main limitation to controllability. In some cases servoactuator input signals were electronically limited to simulate moderate performance flight hardware.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA, Washington Fourth Inter-Center Control Systems Conf.; p 299-321
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  • 63
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    New evidence of the mechanisms of noise generation and radiation of a subsonic jet (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Acoustical Society of America; vol. 57
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  • 64
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    Streamtube analysis of a hydrogen-burning scramjet exhaust and simulation technique (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A scramjet/airframe integration program and a technique for simulating thermally perfect scramjet exhaust flows (freon/argon gas blends) is studied to extend the technique to more complicated flows approaching the actual exhaust flow in complexity. The state of the flow and the accuracy of the substitute gas simulation are analyzed in the case of a shock discontinuity present. Findings are: scramjet exhaust flow is essentially frozen throughout the expansion at Mach 6 and Mach 8; flow behind moderate shocks remains frozen; the technique can accurately track static distributions in scramjet exhaust flows (shocked or unshocked).
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Aircraft; 14; Sept
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  • 65
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    Fretting in aircraft turbine engines (1975)
    In:  CASI
    Details
    Publication Date: 2012-05-22
    Description: The problems created by fretting in turbine engines are discussed. The areas of greatest wear identified with the fan, compressor, and turbine blade mountings being the most critical items. Various methods for reducing or eliminating fretting in a turbine engine are described. Vacuum deposition of coatings by sputtering and ion plating are recommended as an economic method of applying thin films to inhibit fretting.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AGARD Specialists Meeting on Fretting in Aircraft Systems; 17 p
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  • 66
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    Aeroacoustics: Jet noise, combustion and core engine noise (1976)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The papers in this volume deal essentially with the question whether the amplification of noise is due to the jet noise phenomenon or perhaps an interaction of airframe and core engine noise. In the area of jet noise suppression, various promising suppressor concepts are examined. The swirling flow jet noise suppressor is shown to provide significant noise reduction with minimal thrust losses. Progress in the aircraft engine core noise problem is reflected by seven research-type papers. Two possible mechanisms are seen to be responsible for core noise. One is the direct noise radiated from the turbulent combustion in the primary combuster and transmitted through the turbine, passing out the nozzle into the far field. The other mechanism is the noise that is emitted from hot spots being convected through the turbine. Which of these mechanisms (or perhaps both mechanisms) is responsible for core noise, and what are the coupling mechanisms of core engine noise and jet noise are the questions confronting researchers.
    Keywords: AIRCRAFT PROPULSION AND POWER
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  • 67
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    How good is jet lift VTOL technology (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The status of technologies for jet-lift V/STOL aircraft is examined, and a critical review of the performance of jet-lift VTOL aircraft built to date is made. Most jet-lift aircraft have suffered from adverse propulsion-induced effects during takeoff and landing. Flight dynamics of jet-lift aircraft have suffered from shortcomings in static and dynamic stability, control characteristics, and flight path control. Some of the main problems to be considered during the selection of a propulsion system arrangement for a V/STOL fighter are discussed. At present, experimental and analytical data on supersonic V/STOL configurations are insufficient to permit evaluating propulsion system arrangements.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Astronautics and Aeronautics; 15; Dec. 197
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  • 68
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    Generalized dynamic engine simulation techniques for the digital computers (1975)
    In:  CASI
    Details
    Publication Date: 2012-05-22
    Description: Recently advanced simulation techniques have been developed for the digital computer and used as the basis for development of a generalized dynamic engine simulation computer program, called DYNGEN. This computer program can analyze the steady state and dynamic performance of many kinds of aircraft gas turbine engines. Without changes to the basic program, DYNGEN can analyze one- or two-spool turbofan engines. The user must supply appropriate component performance maps and design point information. Examples are presented to illustrate the capabilities of DYNGEN in the steady state and dynamic modes of operation. The analytical techniques used in DYNGEN are briefly discussed, and its accuracy is compared with a comparable simulation using the hybrid computer. The impact of DYNGEN and similar digital programs on future engine simulation philosophy is also discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AGARD Power Plant Controls for Aero-Gas Turbine Eng.; 23 p
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  • 69
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    Effect of endwall cooling on secondary flows in turbine stator vanes (1977)
    In:  CASI
    Details
    Publication Date: 2012-05-19
    Description: An experimental investigation was performed to determine the effect of endwall cooling on the secondary flow behavior and the aerodynamic performance of a coreturbine stator vane. The investigation was conducted in a cold-air, full-annular cascade, where three-dimensional effects could be obtained. Two endwall cooling configurations were tested. In the first configuration, the cooling holes were oriented so that the coolant was injected in line with the inviscid streamline direction. In the second configuration, the coolant was injected at an angle of 15 deg to the inviscid streamline direction and oriented toward the vane pressure surface. In both cases the stator vanes were solid and uncooled so that the effect of endwall cooling could be obtained directly. Total-pressure surveys were taken downstream of the stator vanes over a range of cooling flows at the design, mean-radius, critical velocity ratio of 0.778. Changes in the total-pressure contours downstream of the vanes were used to obtain the effect of endwall cooling on the secondary flows in the stator. Comparisons were made between the two cooled-endwall configurations and with the results obtained previously for solid endwalls.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AGARD Secondary Flows in Turbomachines; 29 p
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  • 70
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    QCSEE - The key to future short-haul air transport (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The paper describes the design and test procedure for the QCSEE (quiet, clean, short-haul experimental engine). The engines designed for the YC-14 and YC-15 STOL aircraft, both use a very low fan pressure ratio to keep jet-flap noise about 3 dB below total system noise. Other noise reducing features discussed are the low tip speed fans and a carefully selected number of fan blades and vanes with adequate spacing between them. Attention is also given to the development of a low emissions combustor, and reduction of fan frame weight, through the use of graphite/epoxy material. The YC-15 engine also employs variable pitch fans to provide thrust reversal, thus saving weight. Finally, it is noted that the tests have proven that the engines could be configurated to meet the needs of a powered lift system without excessively compromising performance or weight.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: ICAO Bulletin; 34; Apr. 197
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  • 71
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    Gas turbine engine emissions - Problems, progress and future (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The current status of the problem of gas turbine engine emissions is reviewed. Presently promulgated EPA standards and their implications for aircraft gas turbines are discussed. The progress and status of emissions reduction technology programs and other efforts which have emphasized advanced combustor technology are reviewed in detail. Also examined are those efforts underway to determine the emissions floor and incorporate those techniques into practical combustors of the future.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Progress in Energy and Combustion Science; 4; 2, 19; 1978
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  • 72
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    Multitube turbojet noise-suppression studies using cross-correlation techniques (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The noise-generating region of a suppressed turbojet exhaust is studied by cross-correlating static pressure fluctuations within the exhaust with far-field sound for Mach numbers up to 0.99, using a 31-tube nozzle having an area ratio of 3.1. Measurements made with an unsuppressed turbojet exhaust having an equivalent area ratio and operating under effectively equal thrust loads serve as the experimental control. Static pressure-level measurements, made with a calibrated high-temperature acoustically damped probe tube, show that noise suppression by multitube nozzles results from reduced turbulence levels. The maximum fluctuating static-pressure level in the unsuppressed turbojet exhaust is typically 5-6 dB higher than static-pressure levels in the suppressed exhaust under conditions of effectively equal static thrust. This suggests that the turbulence intensity in the multitube suppressor flow is reduced in excess of 20% compared with the unsuppressed jet exhaust.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Acoustical Society of America; vol. 63
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  • 73
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    Propulsion (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: NASA aims at developing propulsion technology to reduce the fuel consumption of present engines by 5%, that of new engines of the late 1980s by at least 12%, and that of an advanced early 1990s turboprop by an additional 15%. This paper reviews three separate NASA programs which take up these aims. They are, respectively, Engine Component Improvement, Energy Efficient Engine, and Advanced Turboprops.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Astronautics and Aeronautics; 16; July-Aug
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  • 74
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    Engine requirements for future general aviation aircraft (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The market place is examined for general aviation aircraft into the 1980's. The visible constraints that engine manufacturers must face regardless of the type of cycle are indicated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center The Rotary Combust. Engine; p 175-186
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  • 75
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    Review of the Rhein-Flugzeugbau Wankel powered aircraft program (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The development of light aircraft with special emphasis on modern propulsion systems and production is discussed in terms of the application of rotary engines to aircraft. Emphasis is placed on the integrated ducted-fan propulsion system using rotary engines.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center The Rotary Combust. Engine; p 109-122
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  • 76
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    Update of development on the new Audi NSU rotary engine generation (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Rotary engines with a chamber volume of 750 cc as a two rotor automotive powerplant, called KKM 871 are described. This engine is compared to a 3 liter or 183 cubic inch, six-cylinder reciprocating engine. Emphasis is placed on exhaust emission control and fuel economy.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center The Rotary Combust. Engine 85-107 (SEE N79-15961 07-07)
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  • 77
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    Rotary engine developments at Curtiss-Wright over the past 20 years and review of general aviation engine potential (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The development of the rotary engine as a viable power plant capable of wide application is reviewed. Research results on the stratified charge engine with direct chamber injection are included. Emission control, reduced fuel consumption, and low noise level are among the factors discussed in terms of using the rotary engine in general aviation aircraft.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center The Rotary Combust. Engine; p 123-174
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  • 78
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    Development status of rotary engine at Toyo Kogyo (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Progress in the development of rotary engines which use a thermal reactor as the primary part of the exhaust emission control system is reviewed. Possibilities of further improvements in fuel economy of future rotary engines are indicated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center The Rotary Combust. Engine; p 37-84
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  • 79
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    General aviation energy-conservation research programs (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A review is presented of nonturbine general aviation engine programs underway at the NASA-Lewis Research Center. The program encompasses conventional, lightweight diesel, and rotary engines. Its three major thrusts are: (1) reduced SFC's; (2) improved fuels tolerance; and (3) reducing emissions. Current and planned future programs in such areas as lean operation, improved fuel management, advanced cooling techniques, and advanced engine concepts, are described. These are expected to lay the technology base, by the mid to latter 1980's, for engines whose total fuel costs are as much as 30% lower than today's conventional engines.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: The Rotary Combust. Engine; p 13-35
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  • 80
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    Heat requirements for ice prevention on gas-heated propellers (1950)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Keywords: AIRCRAFT PROPULSION AND POWER
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  • 81
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    Advanced low-NO(x) combustors for supersonic high-altitude gas turbines (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The impact of gas-turbine-engine-powered aircraft on worldwide pollution was defined within two major areas of contribution. First, the contribution of aircraft to the local air pollution of metropolitan areas and, second, the long-term effects on the chemical balance of the stratosphere of pollutants emitted from future generations of high-altitude, supersonic commercial and military aircraft. Preliminary findings indicate that stratospheric oxides of nitrogen (NOx) emissions may have to be limited to very low levels if, for example, ozone depletion with concomitant increases in sea-level radiation, are to be avoided. Theoretical considerations suggest that (NOx) levels as low as 1.0 gram per kilogram of fuel and less should be attainable from a idealized premixed type of combustor. Experimental rig studies were intended to explore new combustor concepts designed to minimize the formation of (NOx) in aircraft gas turbines and to define their major operational problems and limitations.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aircraft Eng. Emissions; p 393-415
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  • 82
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    Soot formation in a turbulent swirling flow (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The qualitative understanding of soot formation in simple models of gas turbine primary-zone combustors is summarized. Soot formation in flame radiation and air pollution was investigated. Results are presented, namely: (1) if the fuel is premixed with air in approximately stoichiometric proportions, the sequence of states that a fluid element undergoes as it burns is quite different from the sequence when liquid or vapor fuel is injected into an air-flow; (2) swirling flows, as are typical or swirl-can combustors, when burning, can amplify small aerodynamic disturbances upstream of the swirl vanes; and (3) different fuels form significantly different amounts of soot. Each of these effects makes major changes in the amount of soot formed in a given combustor.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center Aircraft Eng. Emissions; p 309-321
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  • 83
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    Pollution reduction technology program for turboprop engines (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The reduction of CO, HC, and smoke emissions while maintaining acceptable NO(x) emissions without affecting fuel consumption, durability, maintainability, and safety was accomplished. Component combustor concept screening directed toward the demonstration of advanced combustor technology required to meet the EPA exhaust emissions standards for class P2 turboprop engines was covered. The combustion system for the Allison 501-D22A engine was used, and three combustor design concepts - reverse flow, prechamber, and staged fuel were evaluated.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Lewis Res. Center Aircraft Eng. Emissions; p 125-147
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  • 84
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    Ceramic composite protection for turbine disc bursts (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ceramic composite turbine disc protection panels for the A300B were developed using armor technology. Analytical predictions for modifying the ballistic projectile armor system were verified by a test program conducted to qualify the rotor containment system. With only a slight change in the areal density of the armor system a more than two-fold increase in kinetic energy protection level was achieved. Thickness of the fiberglass reinforced plastic backing material was increased to achieve an optimum ratio of ceramic thickness to backing thickness for the different ballistic defeat condition.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: MIT An Assessment of Technol. for Turbojet Engine Rotor Failures; p 277-293
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  • 85
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    Materials and manufacturing processes for increased life/reliability (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Improvements in both quality and durability of disk raw material for both military and commercial engines necessitated an entirely new concept in raw material process control which imposes careful selection, screening and sampling of the basic alloy ingredients, followed by careful monitoring of the melting parameters in all phases of the vacuum melting sequence. Special care is taken to preclude solidification conditions that produce adverse levels of segregation. Melt furnaces are routinely cleaned and inspected for contamination. Ingots are also cleaned and inspected before entering the final melt step.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: MIT An Assessment of Technol. for Turbojet Engine Rotor Failures; p 347-368
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  • 86
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    Numerical analysis of projectile impact in woven texile structures (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Computer codes were developed for simulating the dynamic fracture and viscoelastic constitutive response due to stress wave interaction and reflections caused by ballistic impact on woven textiles. The method, which was developed for use in the design and analysis of protection devices for personnel armor, has potential for use in studies of rotor blade burst containment at high velocity. Alterations in coding required for burst containment problems are discussed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Assessment of Technol. for Turbojet Engine Rotor Failures; p 247-260
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  • 87
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    Lightweight engine containment (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Kevlar fabric styles and weaves were studied, as well as methods of application for advanced gas turbine engines. The Kevlar material was subjected to high speed impacts by simple projectiles fired from a rifle, as well as more complex shapes such as fan blades released from gas turbine rotors in a spin pit. Just contained data was developed for a variety of weave and/or application techniques, and a comparative containment weight efficiency was established for Kevlar containment applications. The data generated during these tests is being incorporated into an analytical design system so that blade containment trade-off studies between Kevlar and metal case engine structures can be made. Laboratory tests and engine environment tests were performed to determine the survivability of Kevlar in a gas turbine environment.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: MIT An Assessment of Technol. for Turbojet Engine Rotor Failures; p 235-245
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  • 88
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    Approaches to rotor fragment protection (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Key airworthiness design criteria considerations for fragment protection as found in various FAA requirements in FAR Parts 25 and 33, and in interpretive 8110 orders are reviewed. The impact of providing aircraft armor in lieu of engine armor for typical three- and four-engine wide bodied transports for protection within the length of the engine case as well as from fragments exiting ahead of the enlet engine inlet flange is assessed. For protection within the length of the engine case, armor weight penalties, plus fuel burned and dollar cost of carrying the armor protection are defined. Immediately ahead of the inlet flange, direct tangential impacts are predominant, but further forward, rebound impacts predominate. Armor thickness requirements and fuel cost impact of protection are given.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: MIT An Assessment of Technol. for Turbojet Engine Rotor Failures; p 101-103
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  • 89
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    Engine Non-Containment: The UK CAA View (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Airworthiness accidents account for roughly one quarter of the total number of accidents to public transport turbojet aircraft. The most reliable, practicable, and cost-effective means of minimizing damage outside the confines of the nacelle is to make the aircraft design invulnerable to any debris which may affect the aircraft. A failure model was developed for use by aircraft builders in measuring the freedom from catastrophe factor of their design.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: MIT An Assessment of Technol. for Turbojet Engine Rotor Failures; p 11-32
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  • 90
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    Engine sealing and lubrication systems (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Engine sealing programs are discussed which are directed toward the two major classes of engine seals: engine shaft seals and primary gas path seals. In addition, some concepts and results from fundamental lubrication research, as it pertains to the lubrication of bearings, are presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 305-327
    Format: text
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  • 91
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    Refan program (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The JT8D Refan Program for noise reduction is outlined, and the overall objectives and program status, test results, and current noise level predictions are presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 81-97
    Format: text
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  • 92
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    Propulsion system noise reduction (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The progress in propulsion system noise reduction is reviewed. The noise technology areas discussed include: fan noise; advances in suppression including conventional acoustic treatment, high Mach number inlets, and wing shielding; engine core noise; flap noise from both under-the-wing and over-the-wing powered-lift systems; supersonic jet noise suppression; and the NASA program in noise prediction.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 1-63
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  • 93
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    Installation drag considerations as related to turboprop and turbofan engines (1975)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Some of the specific areas associated with straight jet and turboprop engine installations are outlined where drag reduction and, thus, improved aircraft system performance is obtained. Specific areas constitute air intake sizing for general aviation aircraft, exhaust duct geometries and cooling system arrangements for propeller powered aircraft.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Kansas Univ. Proc. of the NASA, Ind., Univ., Gen. Aviation Drag Reduction Workshop; p 245-256
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  • 94
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    Hypersonic propulsion (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The NASA research on scramjet technology for speeds above Mach 5 is reported. A brief overview of the NASA Hypersonic Research Engine (HRE) project is presented with emphasis on the most significant contributions on the HRE to scramjet technology. The work on high-performance airframe-integrated scramjet engines is described, and a new versatile research airplane is discussed with emphasis on propulsion.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 459-474
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  • 95
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    Turbine materials and life prediction (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: The recent developments and future potential of advanced materials for turbine components are described. The components discussed in detail are disks, blades, and vanes.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 209-288
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  • 96
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    Fuel-conservative engine technology (1975)
    In:  Other Sources
    Details
    Publication Date: 2016-06-07
    Description: Aircraft fuel consumption is discussed in terms of its efficient use, and the conversion of energy from sources other than petroleum. Topics discussed include: fuel from coal and oil shale, hydrogen deficiency of alternate sources, alternate fuels evaluation program, and future engines.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Aeron. Propulsion; p 157-190
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  • 97
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    Advanced materials research for long-haul aircraft turbine engines (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The status of research efforts to apply low to intermediate temperature composite materials and advanced high temperature materials to engine components is reviewed. Emerging materials technologies and their potential benefits to aircraft gas turbines were emphasized. The problems were identified, and the general state of the technology for near term use was assessed.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Langley Res. Center CTOL Transport Technol., 1978; p 187-204
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  • 98
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    Gas turbine engine emission reduction technology program (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Progress in the development of combustor technology to meet the standards for the allowable pollutant emission levels of aircraft gas turbine engines is reported. The high-bypass-ratio turbofan engines which power the large commercial aircraft were emphasized along with efforts to reduce emission for near term applications. Recommendations for continuing research to reduce emissions to meet far term needs are given.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Langley Res. Center CTOL Transport Technol., 1978; p 205-216
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  • 99
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    Status of advanced turboprop technology (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Research is reviewed in the following areas: turboprop powered transport aircraft; wind tunnel aerodynamic and acoustics tests of model propellers; turboprop maintenance; and wind tunnel tests on airframe-turboprop interactions. Continued development of the technology for advanced turboprop transport was emphasized.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Langley Res. Center CTOL Transport Technol., 1978; p 139-166
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  • 100
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    Propulsion systems noise technology (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Turbofan engine noise research relevant to conventional aircraft is discussed. In the area of fan noise, static to flight noise differences were discussed and data were presented for two different ways of simulating flight behavior. Experimental results from a swept rotor fan design are presented which show that this concept has potential for reducing the multiple-pure-tone or buzz-saw noise related to the shock waves on a fan operating at supersonic tip speeds. Acoustic suppressor research objectives centered around the effect of the wave system generated by the fan stage that is the input to the treatment. A simplifying and unifying parameter, mode cutoff ratio was described. Results are presented which show that suppressor performance can be improved if the input wave is more precisely described. In jet noise, calculated results showing the potential noise reduction from the use of internal mixer nozzles rather than separate flow nozzles are presented.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NASA. Langley Res. Center CTOL Transport Technol., 1978; p 167-185
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