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  • AERODYNAMICS  (5)
  • Female
  • GEOPHYSICS
  • 1985-1989  (6)
  • 1980-1984
  • 1986  (6)
  • 1
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    Unsteady transonics of a wing with tip store (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 23; 662-668
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Wind-tunnel investigation of the OMAC canard configuration (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Wind-tunnel tests were conducted on a 0.175-scale model of the OMAC Laser 300 canard configuration in the NASA Langley 12-Foot Low-Speed Wind Tunnel to determine its low-speed high angel-of-attack aerodynamic characteristics. The Laser 300 is a general aviation turboprop pusher aircraft utilizing a canard configuration. The design incorporates a low forward wing and a high main wing with a leading-edge droop installed on the outboard panel and tip fins mounted on the wing tips. The model was tested over a range of -6 to 50-deg angle-of-attack and 20 to -20 deg sideslip. Static force and moment data were measured, and the longitudinal and lateral-directional characteristics were determined.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-2608
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unsteady transonics of a wing with tip store (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The presence of tip stores influences both the aerodynamic and the aeroelastic performance of wings. Such effects are more pronounced in the transonic regime. In this study, a theoretical method is developed, for the first time, to compute unsteady transonics of oscillating wings with tip stores. The method is based on the small-disturbance, aerodynamic equations of motion from the potential-flow theory. To validate the method, subsonic and transonic aerodynamic computations are made for a lower-aspect-ratio wing, and they are compared with the available experimental data. Comparisons are favorable. The strong effects of the tip store on the transonic aerodynamics of the wing are also illustrated. The method developed in this steady can be used for transonic, aeroelastic computations of wings with tip stores.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-0010
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Transonic aeroelasticity of wings with tip stores (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The presence of tip stores influences both aerodynamic and aeroelastic performances of wings. Such effects are more pronounced in the transonic regime. In this study, transonic aeroelasticity of wings with tip stores is studied for the first time by a theoretical method using the unsteady-small disturbance transonic aerodynamic equations coupled with modal structural equations of motion. The aerodynamic and structural equations of motion are simultaneously integrated by a time-accurate numerical scheme. To validate the tip store simulation, aeroelastic computations are made for a typical rectangular wing with a tip store and results are correlated with available wind tunnel data for the corresponding wing without a tip store at various flight conditions. Aeroelastic computations are also made for a typical fighter wing with a tip store. Present computations show that it is important to account for the aerodynamics of the tip store, particularly in the transonic regime where the tip store can make the wing aeroelastically unstable.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1007
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Effects of cone surface waviness and freestream noise on transition in supersonic flow (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A comparison of transition on wavy-wall and smooth-wall cones in a Mach 3.5 wind tunnel is made under conditions of either low freestream noise (quiet flow) or high freestream noise (noisy flow). The noisy flow compares to that found in conventional wind tunnels while the quiet flow gives transitional Reynolds numbers on smooth sharp cones comparable to those found in flight. The waves were found to have a much smaller effect on transition than similar sized trip wires. A satisfatory correlating parameter for the effect of waves on transition was simply the wave height-to-length ratio. A given value of this ratio was found to cause the same percentage change in transition location in quiet and noisy flows.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1086
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Uranium series dating of Allan Hills ice (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Uranium-238 decay series nuclides dissolved in Antarctic ice samples were measured in areas of both high and low concentrations of volcanic glass shards. Ice from the Allan Hills site (high shard content) had high Ra-226, Th-230 and U-234 activities but similarly low U-238 activities in comparison with Antarctic ice samples without shards. The Ra-226, Th-230 and U-234 excesses were found to be proportional to the shard content, while the U-238 decay series results were consistent with the assumption that alpha decay products recoiled into the ice from the shards. Through this method of uranium series dating, it was learned that the Allen Hills Cul de Sac ice is approximately 325,000 years old.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; D539-D54
    Format: text
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    NASA TECHNICAL REPORTS
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