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  • 1
    facet.materialart.
    Unknown
    Tunnel constraint for a jet in crossflow (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A facet of a unified tunnel correction scheme which uses wall pressures to determine tunnel induced blockage and upwash is described. With this method, there is usually no need to use data concerning model forces or power settings to find the interference; it follows directly from the pressures and tunnel dimensions. However, highly inclined jets do not produce good pressure signatures and are highly three dimensional, so they must be treated differently. Flow modeling is also discussed.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Research Center. Wind Tunnel Wall Interference Assessment and Correction, 1983; p 273-290
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    A review of the wall pressure signature and other tunnel constraint correction methods for high angle-of-attack tests (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Recent developments concerning correction techniques for high angle of attack testing are reviewed and the results are presented of a letter survey on the methods now in use. The application of the wall pressure signature technique is demonstrated in experiments on several types of models. The method is shown to provide good estimates of tunnel blockage effects and extension to lift interference is discussed. It appears that correctability is limited more by the problem of determining the effects of tunnel induced velocity gradients than by ability to determine the flow field. It is suggested that passive boundary measurement technology diffuses first into high angle of attack production testing, possibly followed by partially adaptive tunnel techniques.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AGARD Wind Tunnel Corrections for High Angle of Attack Models; 16 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Estimation of tunnel blockage from wall pressure signatures: A review and data correlation (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method is described for estimating low speed wind tunnel blockage, including model volume, bubble separation and viscous wake effects. A tunnel-centerline, source/sink distribution is derived from measured wall pressure signatures using fast algorithms to solve the inverse problem in three dimensions. Blockage may then be computed throughout the test volume. Correlations using scaled models or tests in two tunnels were made in all cases. In many cases model reference area exceeded 10% of the tunnel cross-sectional area. Good correlations were obtained regarding model surface pressures, lift drag and pitching moment. It is shown that blockage-induced velocity variations across the test section are relatively unimportant but axial gradients should be considered when model size is determined.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: NASA-CR-152241
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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