Development of Wall Turbulence in Blasius Flow

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

Summary

The subcritical transition in Blasius flow is examined experimentally through observing its response to nonlinear disturbanres due to high- intensity hairpin eddies acoustically excited at the leading edge of boundary- layer plate. When disturbed by the leading-edge-generated hairpin eddies, the near wall flow is found to develop local wall shear layers with streamwise vortices. The local three- dimensional shear layers also evolve into hairpin eddies in succession to lead to the subcritical transition for displacement-thickness Reynolds numbers beyond 330. It is also shown that in terms of u- and v- fluctuations, the intensity of the near wall activity at the above-cited critical Reynolds number is almost the same (or slightly less than) that of the developed wall turbulence.

Keywords

Vortex Smoke 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • M. Asai
    • 1
  • M. Nishioka
    • 1
  1. 1.College of EngineeringUniversity of Osaka PrefectureSakai, OsakaJapan

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