Item Details

Discrete Sonic Jets Used as Boundary-Layer Trips at Mach Numbers of 6 and 8.5

by David R. Stone and Aubrey M. Cary
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1972.
Language
English
Series
NASA Technical Note
Summary
The effect of discrete three-dimensional sonic jets used to promote transition on a sharp-leading-edge flat plate at Mach numbers of 6 and 8.5 and unit Reynolds numbers as high as 2.5 x 100,000 per cm in the Langley 20-inch hypersonic tunnels is discussed. An examination of the downstream flow-field distortions associated with the discrete jets for the Mach 8.5 flow was also conducted. Jet trips are found to produce lengths of turbulent flow comparable to those obtained for spherical-roughness-element trips while significantly reducing the downstream flow distortions. A Reynolds number based upon secondary jet penetration into a supersonic main flow is used to correlate jet-trip effectiveness just as a Reynolds number based upon roughness height is used to correlate spherical-trip effectiveness. Measured heat-transfer data are in agreement with the predictions.
Description
51 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Langley Research Center.
  • Cover title.
  • Bibliography: p. 19-20.
Series Statement
NASA technical note ; NASA TN D-6802
Logo for Copyright Not EvaluatedCopyright Not Evaluated
Technical Details

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    a| Discrete sonic jets used as boundary-layer trips at Mach numbers of 6 and 8.5 c| by David R. Stone and Aubrey M. Cary.
    260
      
      
    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1972.
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    a| 51 p. : b| ill. ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-6802
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    a| Prepared at Langley Research Center.
    500
      
      
    a| Cover title.
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    a| Bibliography: p. 19-20.
    520
      
      
    a| The effect of discrete three-dimensional sonic jets used to promote transition on a sharp-leading-edge flat plate at Mach numbers of 6 and 8.5 and unit Reynolds numbers as high as 2.5 x 100,000 per cm in the Langley 20-inch hypersonic tunnels is discussed. An examination of the downstream flow-field distortions associated with the discrete jets for the Mach 8.5 flow was also conducted. Jet trips are found to produce lengths of turbulent flow comparable to those obtained for spherical-roughness-element trips while significantly reducing the downstream flow distortions. A Reynolds number based upon secondary jet penetration into a supersonic main flow is used to correlate jet-trip effectiveness just as a Reynolds number based upon roughness height is used to correlate spherical-trip effectiveness. Measured heat-transfer data are in agreement with the predictions.
    538
      
      
    a| Mode of access: Internet.
    650
      
    0
    a| Aerodynamics, Hypersonic.
    650
      
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    a| Jets x| Fluid dynamics.
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    a| Boundary layer.
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    a| Cary, Aubrey M.
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    1
      
    a| United States. b| National Aeronautics and Space Administration.
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    a| Langley Research Center.
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    b| UIU c| UIUC d| 20141113 s| google u| uiug.30112106883637 y| 1972 r| pd q| bib

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