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  • ASTROPHYSICS  (112)
  • AERODYNAMICS  (102)
  • 1985-1989  (214)
  • 1988  (214)
  • 1
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    Meridional plasma flow in the outer heliosphere (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Voyager 2 observations made in the outer heliosphere near 25 AU and within 2 deg of the heliographic equatorial plane show periodic variations in the meridional (North/South) flow velocities that are much more prominent than the East/West variations. An autocorrelation analysis shows that the flow variation has a period of about 25.5 days in the latter half of 1986, in approximate agreement with the solar rotation period. The results suggest that increased pressure in interaction regions remains the best candidate for the driver of the nonradial flows.
    Keywords: ASTROPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 15; 1519-152
    Format: text
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  • 2
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    On the nearest molecular clouds. II - MBM 12 and 16 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The paper presents echelle spectra recorded at the D lines of Na I for three stars projected on the high-latitude molecular cloud MBM 16 at l = 172 deg, b = -38 deg. The A stars HD 21142 at about 95 pc and HD 21134 at about 240 pc show strong D-line absorption at the same velocities as the CO emission observed at these positions. The distance to MBM 16 therefore is in the range of 60 to 95 pc. MBM 16 is only 11 deg away from MBM 12, previously placed by the same method at distance of about 65 pc. Consideration is given to the relationship between clouds 12 and 16 and the local hot low-density interstellar gas.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 327; 356-363
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  • 3
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    Multigrid acceleration of the flux-split Euler equations (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 26; 649-654
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  • 4
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    A full-potential theory analysis of the supersonic aerodynamics of a 60-deg delta wing-body configuration (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Experimental spanwise pressure distributions for a 60-deg delta wing/body of approximate fineness ratio 7.6 have been obtained and compared to predictions using full-potential theory. Analysis was performed at Mach 1.6 for angles of attack in the range 0.8 to 10 deg, and for Mach numbers ranging from 1.4 to 1.8 at lift coefficients 0.3 and 0.4. The intent of the study was to examine an attached flow approach for maneuver wing design in the presence of a fuselage. For the Mach number, angle-of-attack conditions considered, the full-potential theory accurately modeled the pressure distributions provided the flow remained attached. By combining the full-potential theory results with an empirical shock-induced separation criterion, it was found that the onset of shock-induced separation can be predicted. The investigation showed that, if an attached-flow approach is used with an empirical method of indicating shock-induced separation, the full-potential method is capable of being used as an effective tool for designing maneuver wings.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 88-0480
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  • 5
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    Static performance of nonaxisymmetric nozzles with yaw thrust-vectoring vanes (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A static test was conducted in the static test facility of the Langley 16 ft Transonic Tunnel to evaluate the effects of post exit vane vectoring on nonaxisymmetric nozzles. Three baseline nozzles were tested: an unvectored two dimensional convergent nozzle, an unvectored two dimensional convergent-divergent nozzle, and a pitch vectored two dimensional convergent-divergent nozzle. Each nozzle geometry was tested with 3 exit aspect ratios (exit width divided by exit height) of 1.5, 2.5 and 4.0. Two post exit yaw vanes were externally mounted on the nozzle sidewalls at the nozzle exit to generate yaw thrust vectoring. Vane deflection angle (0, -20 and -30 deg), vane planform and vane curvature were varied during the test. Results indicate that the post exit vane concept produced resultant yaw vector angles which were always smaller than the geometric yaw vector angle. Losses in resultant thrust ratio increased with the magnitude of resultant yaw vector angle. The widest post exit vane produced the largest degree of flow turning, but vane curvature had little effect on thrust vectoring. Pitch vectoring was independent of yaw vectoring, indicating that multiaxis thrust vectoring is feasible for the nozzle concepts tested.
    Keywords: AERODYNAMICS
    Type: NASA-TP-2813 , L-16389 , NAS 1.60:2813
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  • 6
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    Static performance of an axisymmetric nozzle with post-exit vanes for multiaxis thrust vectoring (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An investigation was conducted in the static test facility of the Langley 16-Foot Transonic Tunnel to determine the flow-turning capability and the nozzle internal performance of an axisymmetric convergent-divergent nozzle with post-exit vanes installed for multiaxis thrust vectoring. The effects of vane curvature, vane location relative to the nozzle exit, number of vanes, and vane deflection angle were determined. A comparison of the post-exit-vane thrust-vectoring concept with other thrust-vectoring concepts is provided. All tests were conducted with no external flow, and nozzle pressure ratio was varied from 1.6 to 6.0.
    Keywords: AERODYNAMICS
    Type: NASA-TP-2800 , L-16371 , NAS 1.60:2800
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  • 7
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    Formation of particulates by ion bombardment of cryogenic ice mixtures (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analysis of the particulates which form upon the bombardment of a gaseous mixture reflecting cosmic molecular abundances with H2(+) ions accelerated at 350 keV. The model of Black and Dalgarno (1977) for the Zeta Oph cloud and an observational determination of the interstellar Ar abundances (Simpson et al., 1986) are used to determine the abundances of the gas mixture. The characteristics of the resulting residue are examined, including photographs and absorbance spectra. The possible astrophysical implications of the experiment are discussed.
    Keywords: ASTROPHYSICS
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  • 8
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    Evaluation of three turbulence models for the prediction of steady and unsteady airloads (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two dimensional quasi-three dimensional Navier-Stokes solvers were used to predict the static and dynamic airload characteristics of airfoils. The following three turbulence models were used: the Baldwin-Lomax algebraic model, the Johnson-King ODE model for maximum turbulent shear stress, and a two equation k-e model with law-of-the-wall boundary conditions. It was found that in attached flow the three models have good agreement with experimental data. In unsteady separated flows, these models give only a fair correlation with experimental data.
    Keywords: AERODYNAMICS
    Type: NASA-TM-101413 , E-4507 , NAS 1.15:101413 , AIAA PAPER 89-0609 , Aerospace Sciences Meeting; Jan 09, 1989 - Jan 12, 1989; Reno, NV; United States
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  • 9
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    Powerful warm infrared sources in early-type galaxies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: IRAS far-infrared sources have been identified with 129 S0, Sa, Sb, and Sc galaxies in a statistically complete sample of 738 galaxies brighter than 14.5 mag and smaller than 4.0 arcmin. In most cases, the far-IR colors and the ratios of far-IR flux to radio flux density are those of normal galactic disks and/or starbursts. The most powerful far-IR sources in S0 and Sa galaxies are just as powerful as the strongest far-IR sources in Sb and Sc galaxies. Bright-IR sources in S0 and Sa galaxies are warm; those in Sc galaxies are cool. Sb galaxies have both warm and cool IR sources. Bright warm IR sources occur much more frequently in barred galaxies than in galaxies without bars for types S0, Sa, and Sb. Bright, cool IR sources are found with increasing frequency along the Hubble sequence, regardless of the presence or absence of a bar. At least some 'S0' galaxies with warm, bright IR sources have peculiar morphologies and ambiguous classifications.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 329; L69-L73
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  • 10
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    Newly detected molecules in dense interstellar clouds (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The last year or so has seen the identification of several new interstellar molecules, including C2S, C3S, C5H, C6H, and (probably) HC2CHO in the cold, dark cloud TMC-1, and the discovery of the first interstellar phosphorus-containing molecule, PN, in the Orion 'plateau' source. Further interesting results include the observations of (C-13))3H2 and C3HD, and the first detection of HCOOH (formic acid) in a (C-13)3H2 cold cloud.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Letters and Communications (ISSN 0888-6512); 26; 3-5
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