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  • AERODYNAMICS  (4)
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  • 1
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    Transonic characteristics of a humped airfoil (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 25; 673
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An experimental study of the turbulent boundary layer on a transport wing in subsonic and transonic flow (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The upper surface boundary layer on a transport wing model was extensively surveyed with miniature yaw probes at a subsonic and a transonic cruise condition. Additional data were obtained at a second transonic test condition, for which a separated region was present at mid-semispan, aft of mid-chord. Significant variation in flow direction with distance from the surface was observed near the trailing edge except at the wing root and tip. The data collected at the transonic cruise condition show boundary layer growth associated with shock wave/boundary layer interaction, followed by recovery of the boundary layer downstream of the shock. Measurements of fluctuating surface pressure and wingtip acceleration were also obtained. The influence of flow field unsteadiness on the boundary layer data is discussed. Comparisons among the data and predictions from a variety of computational methods are presented. The computed predictions are in reasonable agreement with the experimental data in the outboard regions where 3-D effects are moderate and adverse pressure gradients are mild. In the more highly loaded mid-span region near the trailing edge, displacement thickness growth was significantly underpredicted, except when unrealistically severe adverse pressure gradients associated with inviscid calculations were used to perform boundary layer calculations.
    Keywords: AERODYNAMICS
    Type: NASA-TM-102206 , A-89194 , NAS 1.15:102206
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An evaluation of three two-dimensional computational fluid dynamics codes including low Reynolds numbers and transonic Mach numbers (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Full-potential, Euler, and Navier-Stokes computational fluid dynamics (CFD) codes were evaluated for use in analyzing the flow field about airfoils sections operating at Mach numbers from 0.20 to 0.60 and Reynolds numbers from 500,000 to 2,000,000. The potential code (LBAUER) includes weakly coupled integral boundary layer equations for laminar and turbulent flow with simple transition and separation models. The Navier-Stokes code (ARC2D) uses the thin-layer formulation of the Reynolds-averaged equations with an algebraic turbulence model. The Euler code (ISES) includes strongly coupled integral boundary layer equations and advanced transition and separation calculations with the capability to model laminar separation bubbles and limited zones of turbulent separation. The best experiment/CFD correlation was obtained with the Euler code because its boundary layer equations model the physics of the flow better than the other two codes. An unusual reversal of boundary layer separation with increasing angle of attack, following initial shock formation on the upper surface of the airfoil, was found in the experiment data. This phenomenon was not predicted by the CFD codes evaluated.
    Keywords: AERODYNAMICS
    Type: NASA-TM-102840 , A-90202 , NAS 1.15:102840
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Transonic characteristics of a humped airfoil (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A humped airfoil concept to improve the perfomance of supercritical airfoils at off-design conditions in transonic maneuver is introduced. Theoretical aspects of the airfoil and recent results of experimental tests conducted in the high Reynolds number transonic wind tunnels at both NASA Ames Research Center and The Ohio State University are presented. Experimental evidence has shown that the humped airfoil generally has more favorable transonic characteristics in off-design high supercritical flow conditions than a regular supercritical airfoil.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-1239
    Format: text
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    NASA TECHNICAL REPORTS
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