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  • AERODYNAMICS  (4)
  • 1
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    Flow visualization studies of VTOL aircraft models during Hover in ground effect (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flow visualization study of several configurations of a jet-powered vertical takeoff and landing (VTOL) aircraft model during hover in ground effect was conducted. A surface oil flow technique was used to observe the flow patterns on the lower surfaces of the model. There were significant configuration effects. Wing height with respect to fuselage, the presence of an engine inlet duct beside the fuselage, and nozzle pressure ratio are seen to have strong effects on the surface flow angles on the lower surface of the wing. This test was part of a program to improve the methods for predicting the hot gas ingestion (HGI) for jet-powered vertical/short takeoff and landing (V/STOL) aircraft. The tests were performed at the Jet Calibration and Hover Test (JCAHT) Facility at Ames Research Center.
    Keywords: AERODYNAMICS
    Type: NASA-TM-108860 , A-95025 , NAS 1.15:108860
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Jet to freestream velocity ratio computations for a jet in a crossflow (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The flowfield induced by a single, subsonic jet exhausting perpendicularly from a flat plate into a subsonic crossflow has been numerically investigated. Time-averaged solutions were obtained using the thin-layer Navier-Stokes equations and two overlapping grids. Test cases were chosen to match available experimental data where the jet Mach number was 0.78 and the freestream Mach number was varied to represent effective velocity ratios R from 4 to 12. Comparisons of the pressures induced on the flat plate are presented. The results show that the best agreement is obtained for R of 4 and 6, R of 8 is more difficult to resolve, and the R of 12 solution was not satisfactory. It is anticipated that the resolution could be improved by using either smaller time steps or finer grid spacing as R increases.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 93-4860 , ; 12 p.|Dec 01, 1993 - Dec 03, 1993; Santa Clara, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The 1987 Ground Vortex Workshop (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The purpose of this workshop was to discuss the current understanding of the ground vortex phenomena and their effects on aircraft, and to establish directions for further research on advanced, high-performance aircraft designs, particularly those concepts utilizing powered-lift systems; e.g., V/STOL. ASTOVL, and STOL aircraft.
    Keywords: AERODYNAMICS
    Type: NASA-CP-10008 , A-88008 , NAS 1.55:10008 , Apr 22, 1987 - Apr 23, 1987; Moffett Field, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A numerical investigation of a subsonic jet in a crossflow (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A numerical analysis is presented of the flowfield induced by a single subsonic jet exhausting perpendicularly from a flat plate into a subsonic crossflow. The analysis used available experimental data from a test case where the jet Mach number was 0.78 and the freestream Mach number was 0.13. Time-averaged solutions were obtained using the thin-layer Navier-Stokes equations and two overlapping grids. The effect of turbulence model on the solutions was evaluated using two turbulence models: the zero-equation two-layer Baldwin-Lomax (1978) turbulence model and the one-equation Baldwin-Barth (1990) turbulence model. It was found that, for some conditions, the zero-equation Baldwin-Lomax turbulence model gave better results than the one-equation Baldwin-Barth model or the laminar case.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 93-0870 , ; 21 p.|AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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