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  • 1
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    A numerical study of longitudinal vortex interaction with a boundary layer (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A numerical study of vortex generator aerodynamics has been carried out with a reduced set of Navier-Stokes equations. These are used to model the physical process of longitudinal vortex interaction with a turbulent boundary layer on a flat plate in incompressible flow. Comparison with experimental data is used to validate the approach, and detailed predictions are made. Results show an increase in skin friction and a decrease in integral layer thicknesses where the flow is toward the wall, and the reverse where the flow is away from the wall. The major controlling parameters of vortex strength, spacing and height are each found to have optimum values for which the efficiency of boundary-layer thinning is maximized. Vortex core spreading and secondary vorticity produced in the layer are observed and studied, as well as circulation decay and other features of the flow.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-1630
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Aerodynamics of high-performance Ludwieg tubes. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A small perturbation analysis of the flow in a Ludwieg tube supply is described which includes both the growing turbulent boundary-layer and axial pipe nonuniformities. Measured pressure time histories are used to check the theory and its extension to high pipe Mach numbers and large flow perturbations. The nonsteady coupling of this flow to a nozzle is investigated. Calculations are made of the effects on the nozzle boundary layer, while a separate analysis is carried out for the case of complete mixing in a nozzle plenum. The double expansion nozzle is shown to extend Ludwieg-tube capability. Analytical and experimental studies are made of the aerodynamic problems that can arise in these nozzles.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 72-994 , American Institute of Aeronautics and Astronautics, Aerodynamic Testing Conference; Sept. 13-15, 1972; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Gamma-effects on 2-dimensional transonic aerodynamics (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Nonlifting 10% biconvex airfoils are mounted in a 30 x 40 cm Ludwieg-tube-driven transonic test-section and the flow field recorded with a holographic interferometer. Nitrogen, argon, and carbon dioxide are used as the principal test gases. Experiments are conducted with Reynolds number based on chord of (0.5-3.5) x 10 to the 6th with Mach numbers of 0.70, 0.75, and 0.80. Supporting calculations use inviscid transonic small-disturbance and full-potential computer codes coupled with simple integral boundary-layer modeling. Systematic studies show that significant gamma-effects can occur due to shock-induced separation.
    Keywords: AERODYNAMICS
    Type: Aerodynamic Testing Conference; Jun 07, 1976 - Jun 09, 1976; Arlington, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    High Reynolds number flows (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Design and characteristics of quasi-steady devices for simulation of high Reynolds number flows
    Keywords: AERODYNAMICS
    Type: NASA-CR-1838
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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