On the Manner in Which Outer Layer Disturbances Affect Turbulent Boundary Layer Skin Friction

  • A. M. Savill
Conference paper

Summary

This paper presents results, from both experimental studies and turbulence modelling, of the manipulated flow behind flat plate devices introduced into the outer region of turbulent boundary layers. An analysis of mean velocity profiles, in conjunction with drag balance and other measurements for uτ, reveals only small changes in the log law and little influence of plate thickness on skin friction, except in the immediate vicinity of the manipulator where variations in the wall static pressure are recorded. However the drag reducing efficiency of the prefered tandem plate arrangement is found to depend simultaneously on plate length and gap. These observations are discussed together with recent turbulence measurements and previous flow visualisation. Implications emerge regarding the relative importance of the various proposed drag reduction mechanisms, and, in the light of these, alternative ‘triplet’ and ‘quadruplet’ configurations are investigated. It is concluded that larger nett drag reductions may be attainable, while the skin friction distribution downstream of a single plate is shown to be predicted quite accurately by an Algebraic Stress Model.

Keywords

Vortex Vorticity Weinstein Bonnet Lori 

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References

  1. 1.
    M.J. Walsh, A.M. Lindemann: AIAA-84–0347 (1984)Google Scholar
  2. 2.
    M.W. Plesniak, H.M. Nagib: AIAA-85–0518 (1985)Google Scholar
  3. 3.
    J.B. Anders, R.D. Watson: AIAA-85–0520 (1985)Google Scholar
  4. 4.
    J.N. Heffner, L.M. Weinstein, D.M. Bushnell: Prog. Astro. & Aero. 72, 110 (1979)Google Scholar
  5. 5.
    T. Corke, H.M. Nagib, Y.G. Guezennec: NASA CR 165861 (1982)Google Scholar
  6. 6.
    J.C. Mumford, A.M. Savill: in Laminar Turbulent Boundary Layers, ed. by E.M.Uram & H.E.Weber, ASME FED Vol. 11 (1984) pp.41–51Google Scholar
  7. 7.
    A.M.Savill: EUROMECH 181 Abstracts (1984) (see also FFA TN 1984–60)Google Scholar
  8. 8.
    Y.G. Guezennec, H.M. Nagib: AIAA-85–0519 (1985)Google Scholar
  9. 9.
    R. Narasimha, K.R. Sreenivasan: AIAA-85–0517 (1985)Google Scholar
  10. 10.
    D.M. Bushnell: AIAA-84–1527 (1984)Google Scholar
  11. 11.
    A.P. Dowling: J. Fluid Mech. 160, 447 (1985).CrossRefMATHADSMathSciNetGoogle Scholar
  12. 12.
    D.M. Bushnell: AGARD Report No. 723 5 (1985)Google Scholar
  13. 13.
    R.E. Falco: AIAA-83–0377 (1983)Google Scholar
  14. 14.
    J. Lemay, D. Provencal, R. Gordeau, V.D. Nguyen, J. Dickinson: AIAA-85–0521 (1985)Google Scholar
  15. 15.
    R.V. Westphal: AIAA-86–0283 (1986)Google Scholar
  16. 16.
    M. Veuve, T.V. Truong: EUROMECH 181 Abstracts (1984)Google Scholar
  17. 17.
    V.D. Nguyen, A.M. Savill, R.V. Westphal: AIAA TN (to be published)Google Scholar
  18. 18.
    U. Muller: Poster presentation at this Conference (1986)Google Scholar
  19. 19.
    A. Bertelrud, T.V. Truong, F. Avellan: AIAA-82–1370 (1982)Google Scholar
  20. 20.
    S. Takagi: Proc. 15th. Turbulence Symposium, Tokyo (1983)Google Scholar
  21. 21.
    S. Takagi: Proc. 2nd. Asian Congr. Fluid Mech., Beijing (1983).Google Scholar
  22. 22.
    P.R. Bandyopadhyay: Trans. ASME JFE 108, 127 (1986)Google Scholar
  23. 23.
    K.G. Winter: Prog. Aerospace Sci. 18, 1 (1977)CrossRefADSGoogle Scholar
  24. 24.
    P.R. Bandyopadhyay, R.D. Watson: Submittea to Experiments in FluidsGoogle Scholar
  25. 25.
    E. Coustols, J. Cousteix: To be presented at the European Drag Reduction Meeting, Lausanne (1986)Google Scholar
  26. 26.
    S.P. Govindaraju, F.W. Chambers: AIAA-86–0284 (1986)Google Scholar
  27. 27.
    R.F. Blackwelder, S.-I. Chang: AIAA-86–0287 (1986)Google Scholar
  28. 28.
    M. Veuve, T.V. Truong: To be presented at the European Drag Reduction Meeting, Lausanne (1986)Google Scholar
  29. 29.
    P. Balakumar, S.E. Widnall: Physics of Fluids 29 1779 (1986)CrossRefMATHADSMathSciNetGoogle Scholar
  30. 30.
    A.V. Johansson, P.H. Alfredsson: J.F.M. 137, 409 (1983)CrossRefGoogle Scholar
  31. 31.
    J.Lemay, J. Delville, H. Garem, J.-P. Bonnet: To be presented at the European Drag Reduction Meeting, Lausanne (1986)Google Scholar
  32. 32.
    A.S.W. Thomas: AGARD Report No. 723 1 (1985)Google Scholar
  33. 33.
    R.B. Kinney, M.E. Taslim, S.C. Mung: University of Arizona Dept. Aeosp. & Mech. Eng. Rep. No. NAG-1–141 (1984)Google Scholar
  34. 34.
    B. van den Berg: AGARD CP No.365 (1984)Google Scholar
  35. 35.
    D. Agoropoulos: Ph.D. thesis, University of Cambridge (1986)Google Scholar
  36. 36.
    I. Tani, T. Motohashi: Proc. 16th. Turbulence Symposium, Tokyo (1984)Google Scholar
  37. 37.
    A.M. Savill: Proc. 4th International Symposium on Flow Visualisation, Paris ( Hemisphere Publishing Corporation, Washington 1986 )Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • A. M. Savill
    • 1
  1. 1.Engineering DepartmentUniversity of CambridgeCambridgeUK

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