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Effects on the Resistance and on the Separation of V Shapes Passive Manipulators in a Turbulent Boundary Layer

  • R. Monti
  • S. De Ponte
  • E. Levich
Part of the International Centre for Mechanical Sciences book series (CISM, volume 415)

Abstract

In the present investigation surfaces with passive manipulators randomly distributed are studied both in an equilibrium turbulent boundary layer with slightly favorable pressure gradient and in decelerated flows. The main aim of the work is to evaluate the effectiveness of the manipulators for drag reduction in a turbulent boundary layer and their behavior in the limiting strong adverse pressure gradient that characterizes the conditions for maximum pressure recovery. The manipulators consist of a pseudo random 3D V-shaped roughness whose geometry and distribution are function of the Reynolds Number. The drag variations were estimated by direct comparison with measurements conducted with smooth boundaries. What we found is a significant stable drag reduction (up to a maximum of 30%) in a narrow range of Reynolds Numbers, and a small effect on separated flow.

Keywords

Boundary Layer Skin Friction Turbulent Boundary Layer Drag Reduction Vortex Line 
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 Wien 2001

Authors and Affiliations

  • R. Monti
    • 1
  • S. De Ponte
    • 2
  • E. Levich
    • 3
    • 4
  1. 1.Terr@A, H.R.C.E., Dept. IIARPolitecnico di MilanoMilanoItaly
  2. 2.Dip. di Ingegneria Aerospaziale via LambruschiniPolitecnico di MilanoMilanoItaly
  3. 3.Constellation C3D Inc.New YorkUSA
  4. 4.Orley Sci. Comp. LtDYavneIsrael

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