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  • Other Sources  (5)
  • 1990-1994  (5)
  • 1990  (5)
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  • 1990-1994  (5)
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  • 1
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    Pneumatic vortical flow control at high angles of attack (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The injection of thin, high-momentum jets of air into the fuselage forebody boundary layers of the F-18 aircraft is explored numerically as a means of controlling the onset of fuselage vortices and of generating yaw control forces. The study was carried out for an angle of attack of 30 deg with symmetrical and asymmetrical blowing configurations. One-sided blowing results in a strongly asymmetrical flow pattern in the fore portion of the fuselage, leading to a net lateral force.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-0098
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Navier-Stokes predictions of the flowfield around the F-18 (HARV) wing and fuselage at large incidence (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In support of the NASA High Alpha Technology Program, Navier-Stokes solutions have been obtained using the Chimera overset grid scheme for flow over the wing, fuselage, and wing leading-edge extension (LEX) of the F/A-18 High Alpha Research Vehicle (HARV) at high incidence. Solutions are also presented for flow over the fuselage forebody at high angles of attack. The solutions are for turbulent flows at high-Reynolds-number flight-test conditions, and are compared with available qualitative and quantitative experimental data. Comparisons of predicted surface flow patterns, off-surface flow visualization, and surface-pressure distributions are in good agreement with flight-test data. The ability of the numerical method to predict the bursting of the LEX vortex as it encounters the adverse pressure gradient field of the wing is demonstrated, and the capability of predicting high-angle-of-attack aerodynamics around realistic aircraft configurations is established.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-0099
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical simulation of high-incidence flow over the F-18 aircraft (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Navier-Stokes solutions have been obtained using the Chimera overset grid scheme for flow over the wing, fuselage, and wing leading-edge extension (LEX) of the F-18 aircraft at high incidence. Solutions are also presented for flow over the fuselage forebody at high angles of attack. The solutions are for turbulent flows at high-Reynolds number flight-test conditions, and are compared with available qualitative and quantitative experimental data. Comparisons of predicted surface flow patterns, off-surface flow visualizations, and surface-pressure distributions are in good agreement with flight-test data. The ability of the numerical method to predict the bursting of the LEX vortex as it encounters the adverse pressure gradient field of the wing is demonstrated.
    Keywords: AERODYNAMICS
    Type: ICAS Congress; Sept. 9-14, 1990; Stockholm; Sweden
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The effect of turbulence models on the numerical prediction of the flowfield about a prolate spheroid at high angle of attack (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The F3D thin-layer Navier-Stokes code presently used to numerically investigate the three-dimensional separated flow about a prolate spheroid at high incidence analyzes the effect of different turbulence models on the flowfield solution and the characteristics of the predicted flow. The Johnson-King (1984) model is applied in order to evaluate the importance of modeling nonequilibrium effects in predicting flow about a slender body at high incidence; the computations in question are for steady-state, fully turbulent flow. Insight is gained into the effects of turbulence models on flow characteristics, and model effects on the accurate prediction of highly separated and vortical flows about a slender body are demonstrated.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-3106 , AIAA Applied Aerodynamics Conference; Aug 20, 1990 - Aug 22, 1990; Portland, OR; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Zoom Vision System For Robotic Welding (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Rugged zoom lens subsystem proposed for use in along-the-torch vision system of robotic welder. Enables system to adapt, via simple mechanical adjustments, to gas cups of different lengths, electrodes of different protrusions, and/or different distances between end of electrode and workpiece. Unnecessary to change optical components to accommodate changes in geometry. Easy to calibrate with respect to object in view. Provides variable focus and variable magnification.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-29712 , NASA Tech Briefs (ISSN 0145-319X); 14; 11; P. 82
    Format: text
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    NASA TECHNICAL REPORTS
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