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  • Seismology  (16)
  • Pflanzenschädling  (10)
  • FLUID MECHANICS AND HEAT TRANSFER  (7)
  • 42.75
  • AERODYNAMICS
  • AIRCRAFT PROPULSION AND POWER
  • 1950-1954  (43)
  • 1954  (20)
  • 1950  (23)
Collection
Keywords
Publisher
Years
  • 1950-1954  (43)
Year
  • 1
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    Effects of low - velocity layers (1954)
    In:  Geofisica Pura e Applicata, Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 28, no. 6, pp. 1-10, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1954
    Keywords: Low velocity layer ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Slip direction in earthquakes calculated from observed ratios SH/SV (1954)
    In:  Bull. Geol. Soc. Am., Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 65, no. 6, pp. 1342, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1954
    Keywords: Seismology ; Source parameters ; Shear waves ; Polarization
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Larger shocks of 1953 (1954)
    California Institute of Technology Pasadena
    In:  Seismological Laboratory Bulletin, Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 1953, no. 6, pp. 98, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1954
    Keywords: Earthquake catalog ; Seismology ; Seismicity
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Low-velocity layers in the earth's mantle (1954)
    In:  Bull. Geol. Soc. Am., Los Angeles California, 1 p., California Institute of Technology Pasadena, vol. 65, no. 6, pp. 337-347, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1954
    Keywords: Low velocity layer ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    Seismicity of Southern California (1954)
    In:  Bull. California Division of Mines San Francisco, Luxembourg, National Academy of Sciences of the USA, vol. 170, no. 3-5, pp. 19-25, pp. B05311, (ISSN: 1340-4202)
    Details
    Publication Date: 1954
    Keywords: Seismicity ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Progress report, Seismological Laboratory, California Institute of Technology, 1953 (1954)
    In:  Trans. Am. Geophys. Union, Beijing, Pergamon, vol. 35, no. 3-4, pp. 979-987, pp. 1246
    Details
    Publication Date: 1954
    Keywords: Seismology ; Project report/description ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 7
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    Zum Massenflug der Blattläuse (1954)
    In:  Gesunde Pflanzen 6; p.166-168
    Details
    Publication Date: 1954
    Description: Der Autor erklärt das massenhafte Auftreten verschiedener Blattlausarten Ende Mai 1954 mit trockenem warmem Wetter und nennt 19°C Tagesmitteltemperatur und Schwachwindigkeit als Fluginitiator für die Blattläuse. KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Berlin, Hannover, Bonn ; 1954 ; Pflanzenschädling ; Witterung
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    BIBLIOGRAPHY INKA BB
  • 8
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    Untersuchungen zur Bekämpfung der Rapsschädlinge. III. Zur Biologie und Bekämpfung des Kohlschotenrüßlers (Ceutorrhynchus assimilis Payk.) und der Kohlschotengallmücke (Dasyneura brassicae Winn.) (1954)
    In:  Nachrichtenblatt deutsch. Pflanzenschutzdienst, p. 128-135
    Details
    Publication Date: 1954
    Description: Bericht über Untersuchungen zur Terminwahl für die Bekämpfung von Kohlschotenrüßler und Kohlschotengallmücke sowie Vergleiche der Ergebnisse mit der bisherigen Literatur KATASTER-BESCHREIBUNG: Einfluss der Temperatur auf das Auftreten des Kohlschotenrüßlers KATASTER-DETAIL: Delta T +: Tmit 〉 15°C, dann Erscheinen des Kohlschotenrüßlers
    Keywords: Sachsen-Anhalt ; 1952-1953 ; Pflanzenschädling ; Temperatur ; Raps
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    BIBLIOGRAPHY INKA BB
  • 9
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    Die Vergilbungskrankheit der Rübe (1954)
    In:  Mitteilungen aus der Biologischen Zentralanstalt für Land- und Forstwirtschaft Berlin-Dahlem, Heft 79
    Details
    Publication Date: 1954
    Description: Zusammenfassender Bericht über die in den Jahren 1947-1952 in Westdeutschland durchgeführten Untersuchungen zur Epidemiologie, Verbreitung, wirtschaftlichen Bedeutung und Bekämpfung dieser Virose KATASTER-BESCHREIBUNG: Hauptbefallsgebiete sind solche, mit mildem Winterklima, in denen die langjährigen Mittelwerte des kältesten Monats Januar nicht unter 0°C abfallen; KATASTER-DETAIL: Delta T(Sommer)+ und Delta Nied (Sommer) -, dann Delta t(Individualentwicklung der Überträger)- und Massenentwicklung (der Überträger) +; Delta T(Sommer)+ und Delta Nied (Sommer)-, dann Vergilbungsschäden +; Delta T - und Delta Lichtintensität -, dann Wirkung des Virus -;
    Keywords: Westdeutschland ; 1947-1952 ; Infektionskrankheiten ; Ertrag ; Niederschlag ; Pflanzenkrankheit ; Pflanzenschädling ; Temperatur ; Trockenheit ; Wachstum ; Witterung ; Düngung
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  • 10
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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
  • 11
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    Seismicity of the Earth and Associated Phenomena (1954)
    Princeton Univ. Press
    In:  Princeton, New Jersey, 9 + 310 pp., Princeton Univ. Press, vol. 7, no. XVI:, pp. 385-389, (ISBN 0-12-305355-2)
    Details
    Publication Date: 1954
    Keywords: Textbook of geophysics ; Seismology ; Seismicity
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    BIBLIOGRAPHY SEISMOLOGY
  • 12
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    Aerodynamic forces, moments, and stability derivatives for slender bodies of general cross section (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: AERODYNAMICS
    Type: NACA-TN-3283
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    NASA TECHNICAL REPORTS
  • 13
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    Impingement of Water Droplets on NACA 65A004 Airfoil at 8 deg Angle of Attack (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The trajectories of droplets in the air flowing past an NACA 65AO04 airfoil at an angle of attack of 8 deg were determined.. The amount of water in droplet form impinging on the airfoil, the area of droplet impingement, and the rate of droplet impingement per unit area on the airfoil surface were calculated from the trajectories and presented to cover a large range of flight and atmospheric conditions. These impingement characteristics are compared briefly with those previously reported for the same airfoil at an angle of attack of 4 deg.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3155
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    NASA TECHNICAL REPORTS
  • 14
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    Effect of Ice Formations on Section Drag of Swept NACA 63A-009 Airfoil with Partial-Span Leading-Edge Slat for Various Modes of Thermal Ice Protection (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of primary and runback ice formations on the section drag of a 36 deg swept NACA 63A-009 airfoil section with a partial-span leading-edge slat were studied over a range of angles of attack from 2 to 8 deg and airspeeds up to 260 miles per hour for icing conditions with liquid-water contents ranging from 0.39 to 1.23 grams per cubic meter and datum air temperatures from 10 to 25 F. The results with slat retracted showed that glaze-ice formations caused large and rapid increases in section drag coefficient and that the rate of change in section drag coefficient for the swept 63A-009 airfoil was about 2-1 times that for an unswept 651-212 airfoil. Removal of the primary ice formations by cyclic de-icing caused the drag to return almost to the bare-airfoil drag value. A comprehensive study of the slat icing and de-icing characteristics was prevented by limitations of the heating system and wake interference caused by the slat tracks and hot-gas supply duct to the slat. In general, the studies showed that icing on a thin swept airfoil will result in more detrimental aerodynamic characteristics than on a thick unswept airfoil.
    Keywords: AERODYNAMICS
    Type: NACA-RM-E53J30
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    NASA TECHNICAL REPORTS
  • 15
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    Variation of Local Liquid-Water Concentration About and Ellipsoid of Fineness Ratio 5 Moving in a Droplet Field (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Trajectories of water droplets about an ellipsoid of revolution with a fineness ratio of 5 (which often approximates the shape of an aircraft fuselage or missile) were computed with the aid of a differential analyzer. Analyses of these trajectories indicate that the local concentration of liquid water at various points about an ellipsoid in flight through a droplet field varies considerably and under some conditions may be several times the free-stream concentration. Curves of the local concentration factor as a function of spatial position were obtained and are presented in terms of dimensionless parameters Re(sub 0) (free-stream Reynolds number) and K (inertia), which contain flight and atmospheric conditions. These curves show that the local concentration factor at any point is very sensitive to change in the dimensionless parameters Re(sub 0) and K. These data indicate that the expected local concentration factors should be considered when choosing the location of, or when determining antiicing heat requirements for, water- or ice-sensitive devices that protrude into the stream from an aircraft fuselage or missile. Similarly, the concentration factor should be considered when choosing the location on an aircraft of instruments that measure liquid-water content or droplet-size distribution in the atmosphere.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3153
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    NASA TECHNICAL REPORTS
  • 16
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    Impingement of water droplets on wedges and double-wedge airfoils at supersonic speeds (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TR-1159
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    NASA TECHNICAL REPORTS
  • 17
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    Experimental Investigation of Sublimation of Ice at Subsonic and Supersonic Speeds and Its Relation to Heat Transfer (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental investigation was conducted in a 3.84- by 10-inch tunnel to determine the mass transfer by sublimation, heat transfer, and skin friction for an iced surface on a flat plate for Mach numbers of 0.4, 0.6, and 0.8 and pressure altitudes to 30,000 feet. Measurements of rates of sublimation were also made for a Mach number of 1.3 at a pressure altitude of 30,000 feet. The results show that the parameters of sublimation and heat transfer were 40 to 50 percent greater for an iced surface than was the bare-plate heat-transfer parameter. For iced surfaces of equivalent roughness, the ratio of sublimation to heat-transfer parameters was found to be 0.90. The sublimation data obtained at a Mach number of 1.3 showed no appreciable deviation from that obtained at subsonic speeds. The data obtained indicate that sublimation as a means of removing ice formations of appreciable thickness is usually too slow to be of mach value in the de-icing of aircraft at high altitudes.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3104
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    NASA TECHNICAL REPORTS
  • 18
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    Impingement of Water Droplets on an Ellipsoid with Fineness Ratio 5 in Axisymmetric Flow (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The presence of radomes and instruments that are sensitive to water films or ice formations in the nose section of all-weather aircraft and missiles necessitates a knowledge of the droplet impingement characteristics of bodies of revolution. Because it is possible to approximate many of these bodies with an ellipsoid of revolution, droplet trajectories about an ellipsoid of revolution with a fineness ratio of 5 were computed for incompressible axisymmetric air flow. From the computed droplet trajectories, the following impingement characteristics of the ellipsoid surface were obtained and are presented in terms of dimensionless parameters: (1) total rate of water impingement, (2) extent of droplet impingement zone, (3) distribution of impinging water, and (4) local rate of water impingement.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-3099
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    NASA TECHNICAL REPORTS
  • 19
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    A flight investigation of the practical problems associated with porous-leading-edge suction (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79864 , NACA-TN-3062
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    NASA TECHNICAL REPORTS
  • 20
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    A theoretical study of the effect of forward speed on the free-space sound-pressure field around propellers (1954)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Keywords: AERODYNAMICS
    Type: NASA-TM-79844 , NACA-TR-1198 , NACA-TN-3018
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    NASA TECHNICAL REPORTS
  • 21
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    Das Tibet-Beben vom 15. August 1950 (1950)
    In:  Geologische Rundschau, Milano, California Institute of Technology Pasadena, vol. 38, no. 6, pp. 164, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1950
    Keywords: Seismology ; Earthquake ; Seismicity ; China
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    BIBLIOGRAPHY SEISMOLOGY
  • 22
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    Earthquakes in North America (1950)
    In:  Science, Milano, California Institute of Technology Pasadena, vol. 111, no. 6, pp. 319-324, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1950
    Keywords: Seismology ; Seismicity
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    BIBLIOGRAPHY SEISMOLOGY
  • 23
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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
  • 24
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    Progress report, Seismological Laboratory, California Institute of Technology, 1949 (1950)
    In:  Trans. Am. Geophys. Union, Beijing, Pergamon, vol. 31, no. 3-4, pp. 463-467, pp. 1246
    Details
    Publication Date: 1950
    Keywords: Seismology ; Project report/description ; EOS
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    BIBLIOGRAPHY SEISMOLOGY
  • 25
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    An earth model based on a compressibility-pressure hypothesis (1950)
    In:  Monthly Not. R. astr. Soc., Geophys., Tulsa, 3-4, vol. Suppl. 6, no. 1, pp. 50-59, pp. B09405, (ISBN: 0-12-018847-3)
    Details
    Publication Date: 1950
    Keywords: Seismology ; D" ; density ; Earth model, also for more shallow analyses !
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    BIBLIOGRAPHY SEISMOLOGY
  • 26
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    Revised travel time curves for Southern California (1950)
    In:  Bull. Geol. Soc. Am., Milano, California Institute of Technology Pasadena, vol. 61, no. 6, pp. 1546, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1950
    Keywords: Travel time ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 27
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    Larger shocks of 1949 (1950)
    California Institute of Technology Pasadena
    In:  Seismological Laboratory Bulletin, Milano, California Institute of Technology Pasadena, vol. 1949, no. 6, pp. 72, pp. L24306, (ISBN: 0534351875, 2nd edition)
    Details
    Publication Date: 1950
    Keywords: Earthquake catalog ; Seismology ; Seismicity
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    BIBLIOGRAPHY SEISMOLOGY
  • 28
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    The T phase of shallow-focus earthquakes (1950)
    In:  Bull. Seism. Soc. Am., Warszawa, EGS, vol. 40, no. 5, pp. 25-51, pp. B05S16, (ISSN: 1340-4202)
    Details
    Publication Date: 1950
    Keywords: Seismology ; T phase ; Nuclear explosion ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 29
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    Über die Wirkung des Rapserdfloh-Larvenbefalls auf die Rapspflanze (1950)
    In:  Mitteilungen aus der Biologischen Zentralanstalt für Land- und Forstwirtschaft, Berlin-Dahlem, Heft 69
    Details
    Publication Date: 1950
    Description: Bericht über die Ergebnisse der Untersuchungen zu den Wechselwirkungen zwischen Larve und Wirtspflanze KATASTER-BESCHREIBUNG: Einfluss der Temperatur auf den Larvenbefall KATASTER-DETAIL: Delta T -, dann Entwicklungsdauer der Larven +; T 〉 0°C, dann Froststarre und Wanderfähigkeit -; Delta T - und Delta Relf +, dann Larvenmortalität +
    Keywords: Berlin-Dahlem ; 1948-1949 ; Insekten ; Luftfeuchte ; Pflanzenschädling ; Temperatur ; Raps
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    BIBLIOGRAPHY INKA BB
  • 30
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    Über die Überwinterung des Kartoffelkäfers (Leptinotarsa decemlineata Say) und sein Erscheinen im Frühjahr in seinen Beziehungen zu meteorologischen Faktoren (1950)
    In:  Nachrichtenblatt des deutschen Pflanzenschutzdienstes 2.Jahrg., Nr.11; p.161-165
    Details
    Publication Date: 1950
    Description: In Freilandversuchen wurden Temperaturen ermittelt, bei denen Kartoffelkäfer den Boden im Frühjahr verlassen. Zudem wurden Minimalwerte für das Überleben in verschiedenen Bodenarten ermittelt. KATASTER-BESCHREIBUNG: Ein kritischer Wert der Bodentemperatur wurde für das massenhafte Verlassen des Bodens durch den Kartoffelkäfer ermittelt. Allerdings wurden auch bei 12,5°C Bodentemperatur bereits Kartoffelkäfer an der Oberfläche beobachtet. KATASTER-DETAIL: Kritischer Wert= 16,6°C Bodentemperatur (in 50cm Tiefe)
    Keywords: Heidelberg ; 1949-1950 ; Kartoffeln ; Pflanzenschädling ; Hackfrüchte
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    BIBLIOGRAPHY INKA BB
  • 31
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    Die Bedeutung des Windes und der Thermik für die Verbreitung des Insekten, namentlich der grünen Pfirsichblattlaus (1950)
    In:  Zeitschrift für Pflanzenbau und Pflanzenschutz, p. 241-266
    Details
    Publication Date: 1950
    Description: Untersuchungen zur Verbreitung und zum Massenwechsel der grünen Pfirsichblattlaus hinsichtlich der Faktoren Wind und Thermik KATASTER-BESCHREIBUNG: Zusammenhang zwischen Massenvermehrung der Laus und Morphologie sowie meteorologischen Verhältnissen der Landschaft KATASTER-DETAIL: Wind +, dann Pfirsichblattlaus Wanderung +; Wind +, dann Strecke +; Sonneneinstrahlung +, dann Ausbreitung +; Nied +, dann Ausbreitung -;
    Keywords: Bayern ; 1950 ; Insekten ; Pflanzenschädling ; Wind ; Witterung
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  • 32
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    Über die Frühjahrsentwicklung der grünen Pfirsichblattlaus (Myzodes persicae Sulzer) am Primärwirt im Hinblick auf ihre Bedeutung als Virusüberträger im Kartoffelfeld (1950)
    In:  Z. Pflanzenkrankheiten (Pflanzenpathol.) Pflanzenschutz, p. 351-357
    Details
    Publication Date: 1950
    Description: Untersuchungen zur Schlüpfzeit, der Generationszahl und der Abflugzeiten von Myzodes persicae Sulzer am Pfirsichbaum KATASTER-BESCHREIBUNG: Zusammenhang zwischen Klima, Witterung und Schlüpfablauf von Myzodes persicae KATASTER-DETAIL: Delta T -, dann Verzögerung im Schlüpfablauf
    Keywords: Bonn ; 1947-1950 ; Kartoffeln ; Pflanzenschädling ; Temperatur
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    BIBLIOGRAPHY INKA BB
  • 33
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    Untersuchungen über die Möhrenfliege (Psila rosae F.) in Schleswig-Holstein (1950)
    In:  Nachrichtenblatt des Deutschen Pflanzenschutzdienstes, p. 171-172
    Details
    Publication Date: 1950
    Description: Bericht über die Beobachtungen zur Entwicklung und zum Auftreten der Möhrenfliege unter dem Einfluss der Witterung und der Lage KATASTER-BESCHREIBUNG: Einfluss der Witterung und der Lage auf die Befallsstärke der Fliege KATASTER-DETAIL: Delta Lichtintensität +, dann Möhrenfliegenbefall -; Delta Nied +, dann Entwicklung der Maden +; Delta Wind +, dann Befall -
    Keywords: Schleswig-Holstein ; 1948-1949 ; Insekten ; Niederschlag ; Pflanzenschädling ; Temperatur ; Trockenheit ; Wind ; Witterung ; Sonnenscheindauer ; Gemüse
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    BIBLIOGRAPHY INKA BB
  • 34
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    Nachrichtenblatt des deutschen Pflanzenschutzdienstes (1950)
    In:  Zeitschrift
    Details
    Publication Date: 1950
    Description: Detailierte Berichte über das Auftreten von Schaderregern in der Landwirtschaft für jedes Jahr; Zusammenhänge zu Witterungsbedingungen werden zu Beginn der entsprechenden Hefte, sowie teilw. bei Besprechung der jeweiligen Schaderreger hergestellt KATASTER-BESCHREIBUNG: KATASTER-DETAIL:
    Keywords: Westdeutschland, regional aufgelöst ; 1950-2008 ; Pflanzenkrankheit ; Pflanzenschädling
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    BIBLIOGRAPHY INKA BB
  • 35
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    Die Zunahme wichtiger Getreideschädlinge als Folge der besonderen Witterungserscheinungen in den letzten Jahren (1950)
    In:  Pflanzenschutz, Jahrgang 2, Nr. 8, p. 95-97
    Details
    Publication Date: 1950
    Description: Beobachtungen zum Auftreten von Roggengallmücke, Halmfliege, Getreidehalmwespe, Hafermilbe und Zwergzikade unter bestimmten Witterungsbedingungen (warme und trockene Sommer und Herbste) KATASTER-BESCHREIBUNG: Einfluss der Witterung (Temperatur und Niederschlag) im Sommer und Herbst auf das Auftreten der Getreideschädlinge KATASTER-DETAIL: Delta T (Sommer und Herbst) + und Delta Nied (Sommer und Hebrst) -, dann Auftreten +; Trockenperioden über mindestens 2 Jahre, dann Massenauftreten
    Keywords: Bayern ; 1947-1950 ; Anbautermine ; Landwirtschaft ; Niederschlag ; Pflanzenschädling ; Roggen ; Temperatur ; Trockenheit ; Weizen ; Witterung
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    BIBLIOGRAPHY INKA BB
  • 36
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    Heat requirements for ice prevention on gas-heated propellers (1950)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: AIRCRAFT PROPULSION AND POWER
    Format: text
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  • 37
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    Penetration of Air Jets Issuing from Circular, Square, and Elliptical Orifices Directed Perpendicularly to an Air Stream (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An experimental investigation was conducted to determine the penetration of air jets d.irected perpendicularlY to an air stream. Jets Issuing from circular, square, and. elliptical orifices were investigated. and. the jet penetration at a position downstream of the orifice was determined- as a function of jet density, jet velocity, air-stream d.enaity, air-stream velocity, effective jet diameter, and. orifice flow coeffIcient. The jet penetrations were determined for nearly constant values of air-stream density at three tunnel-air velocities arid for a large range of Jet velocities and. densities. The results were correlated in terms of dimensionless parameters and the penetrations of the various shapes were compared. Greater penetration was obtained. with the square orifices and the elliptical orifices having an axis ratio of 4:1 at low tunnel-air velocities and low jet pressures than for the other orifices investigated. The square orifices gave the best penetrations at the higher values of tunnel-air velocity and jet total pressure.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-TN-2019
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  • 38
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    The Effect of Ice Formations on Propeller Performance (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Measurements of propeller efficiency loss due to ice formation are supplemented by an analysis to establish the magnitude of efficiency losses to be anticipated during flight in icing conditions. The measurements were made during flight in natural icing conditions; whereas the analysis consisted of an investIgation of changes in blade-section aerodynamic characteristics caused by ice formation and the resulting propeller efficiency changes. Agreement in the order of magnitude of eff 1- ciency losses to be expected is obtained between measured and analytical results. The results indicate that, in general, efficiency losses can be expected to be less than 10 percent; whereas maximum losses, which will be encountered only rarely, may be as high as 15 or 20 percent. Reported. losses larger than 15 or 20 percent, based on reductions in airplane performance, probably are due to ice accretions on other parts of the airplane. Blade-element theory is used in the analytical treatment, and calculations are made to show the degree to which the aerodynamic characteristics of a blade section. must be altered to produce various propeller efficiency losses. The effects of ice accretions on airfoil-section characteristics at subcritical speeds and their influence on drag-divergence Mach number are examined, and. the attendant maximum efficiency losses are computed. The effect of kinetic heating on the radial extent of ice formation is considered, and its influence on required length of blade heating shoes is discussed. It is demonstrated how the efficiency loss resulting from an icing encounter is influenced by the decisions of the pilot in adjusting the engine and propeller controls.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NACA-TN-2212
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  • 39
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    Investigation of Power Requirements for Ice Prevention and Cyclical De-Icing of Inlet Guide Vanes with Internal Electric Heaters (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An investigation was conducted to determine the electric power requirements necessary for ice protection of inlet guide vanes by continuous heating and by cyclical de-icing. Data are presented to show the effect of ambient-air temperature, liquid-water content, air velocity, heat-on period, and cycle times on the power requirements for these two methods of ice protection. The results showed that for a hypothetical engine using 28 inlet guide vanes under similar icing conditions, cyclical de-icing can provide a total power saving as high as 79 percent over that required for continuous heating. Heat-on periods in the order of 10 seconds with a cycle ratio of about 1:7 resulted in the best over-all performance with respect to total power requirements and aerodynamic losses during the heat-off period. Power requirements reported herein may be reduced by as much as 25 percent by achieving a more uniform surface-temperature distribution. A parameter in terms of engine mass flow, vane size, vane surface temperature, and the icing conditions ahead of the inlet guide vanes.was developed by which an extension of the experimental data to icing conditions and inlet guide vanes, other than those investigated was possible.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NACA-RM-E50H29
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  • 40
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    Icing Characteristics and Anti-Icing Heat Requirements for Hollow and Ternally Modified Gas-Heated Inlet Guide Vanes (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A two-dimensional inlet-guide-vane cascade was investigated to determine the effects of ice formations on the pressure losses across the guide vanes and to evaluate the heated gas flow and temperature required to prevent Icing at various conditions. A gas flow of approximately 0.4 percent of the inlet-air flow was necessary for anti-icing a hollow guide-vane stage at an inlet-gas temperature of 500 F under the following icing conditions: air velocity, 280 miles per hour; water content, 0.9 gram per cubic meter; and Inlet-air static temperature, 00 F. Also presented are the anti-icing gas flows required with modifications of the hollow Internal gas passage, which show heatinput savings greater than 50 percent.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NACA-RM-E50I08
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  • 41
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    The spanwise distribution of lift for minimum induced drag of wings having a given lift and a given bending moment (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The problem of the minimum induced drag of wings having a given lift and a given span is extended to include cases in which the bending moment to be supported by the wing is also given. The theory is limited to lifting surfaces traveling at subsonic speeds. It is found that the required shape of the downwash distribution can be obtained in an elementary way which is applicable to a variety of such problems. Expressions for the minimum drag and the corresponding spanwise load distributions are also given for the case in which the lift and the bending moment about the wing root are fixed while the span is allowed to vary. The results show a 15-percent reduction of the induced drag with a 15-percent increase in span as compared with results for an elliptically loaded wing having the same total lift and bending moment.
    Keywords: AERODYNAMICS
    Type: NACA-TN-2249 , Collected Works of Robert T. Jones; p 539-556
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  • 42
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    Icing-protection requirements for reciprocating-engine induction systems (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NACA-TR-982
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  • 43
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    Investigation of Aerodynamic and Icing Characteristics of Water-Inertia-Separation Inlets for Turbojet Engines (1950)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an investigation of several internal water-inertia-separation inlets consisting of a main duct and an alternate duct designed to prevent automatically the entrance of large quantities of water into a turbojet engine in icing conditions are presented. Total-pressure losses and icing characteristics for a direct-ram inlet and the inertia-separation inlets are compared at similar aerodynamic and simulated icing conditions. Complete ice protection for inlet guide vanes could not be achieved with the inertia-separation inlets investigated. Approximately 8 percent of the volume of water entering the nacelles remained. In the air passing into the compressor inlet. Heavy alternate-duct-elbow ice formations caused by secondary inertia separation resulted in rapid total-pressure losses and decreases in mass flow. The duration in an icing condition for an inertia-separation- inlet, without local surface heating, was increased approximately four times above that for a direct-ram inlet with a compressor-inlet screen. For normal nonicing operation, the inertia-separation- inlet total-pressure losses were comparable to a direct-ram installation. The pressure losses and the circumferential uniformity of the mass flow in all the inlets were relatively independent of angle of attack. Use of an inertia-separation inlet would in most cases require a larger diameter nacelle than a direct-ram inlet in order to obtain an alternate duct sufficiently large to pass the required engine air flow at duct Mach numbers below 1.0 at the minimum area.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: NACA-RM-E50E03
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