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Cryogenic Tunnel Activities at the University of Tsukuba

  • Tsutomu Adachi
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)

Abstract

Cryogenic wind tunnel is a useful apparatus to get high Reynolds-number flow independent of Mach-number. In the high Reynolds-number flow, thickness of boundary layer becomes thinner. Then the surface conditions of the body have much effects on the flow phenomena and on drag. Using cryogenic wind tunnel, we made researches of the effects of surface roughness of a cylinder. Grooves engraved parallel to flow on a flat plate, i.e., riblet, are effective to reduce drag. We measured the effects of grooves along circumference of a cylinder. It showed a marked reduction in drag. The effects of V-grooves are classified into two cases. The one is the original effects of riblet, i.e., to supress bursting and turbulent sepration. In the other case, V-grooves contributes to keep laminar boundary layers long along the surface. In this case, pressure distribution around the surface resembles closely to that of potential flow.

Keywords

Surface Roughness Wind Tunnel Drag Coefficient Drag Reduction Laminar Boundary Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    D.A. Dress, Computer program for calculating flow parameters and requirements for cryogenic wind tunnels, NASA Technical Memorandum 87609(1985).Google Scholar
  2. 2.
    P.L. Lawsing, D.A. Dress, and R.A. Kilgore, Description of the insulation system for the Langley 0.3-meter transonic wind tunnel, NASA Technical Memorandum 86274(1985).Google Scholar
  3. 3.
    T. Adachi, K. Matsuuchi, and T. Kawai, High Reynolds-number flow experiments using cryogenic wind tunnel, Proc. of The ASME/JSME Thermal Engineering Joint Conference, 5:371(1991).Google Scholar
  4. 4.
    T. Adachi, H. Maeda, M. Shiono, T. Ozaki, K. Matsuuchi, and T. Kawai, Drag reduction of circular vcylinder in the high-Reynolds-number range, Bulletin of JSME(in Japanese), 59–558.Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Tsutomu Adachi
    • 1
  1. 1.Institute of Engineering MechanicsUniversity of TsukubaTsukubaJapan

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