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Drag Reduction by Passive Devices—a Review of some Recent Developments

  • A. M. Savill
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Abstract

There is currently considerable academic and industrial interest in the possibility of controlling the eddy structure of turbulent boundary layers by passive means (either to reduce skin friction drag, self-noise and mixing or alternatively to increase mixing and heat transfer), both for the practical benefits that may be achieved and for the insight such studies can provide into the mechanisms and dynamics of these flows. A concentrated research programme at NASA Langley [see 1,2] and many other laboratories in the USA, India and Japan [3], together with an increasingly collaborative effort between research groups in Europe (and Canada) [2,4], has established that turbulent skin friction drag can be reduced by suitably scaled modified wall geometries, most notably longitudinal grooves or ’riblets’, and thin plate or aerofoil outer-layer-devices (variously also known as LEBUs or manipulators/manipulateurs(Fr)) introduced into the flow itself. Indeed it has now been demonstrated repeatedly that surface drag can be reduced by up to 8% (nett), at least below M=1.2 [see 2], in nominally zero pressure gradient plane flow over either machined/moulded riblets or plastic riblet sheets manufactured by 3M Inc or Hoechst, and there is some evidence that similar benefits might be attainable with aerofoil manipulators.

Keywords

Wall Shear Stress Skin Friction Drag Reduction Adverse Pressure Gradient Drag Measurement 
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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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • A. M. Savill
    • 1
  1. 1.Rolls-Royce Senior Research Associate, Department of EngineeringUniversity of CambridgeEngland

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