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ISSN オンライン: 2642-0554

EXPERIMENTAL STUDY ON NON-EQUILIBRIUM TURBULENT BOUNDARY LAYER WITH SEPARATION, REATTACHMENT, AND REDEVELOPMENT

Simon Song
Department of Mechanical Engineering Stanford University Stanford, CA 94305-3030, USA; Sandia National Laboratory Livermore, California 94551-9951, USA; Department of Mechanical Engineering, Hanyang University, Korea

John K. Eaton
Dept. of Mechanical Engineering Stanford University 488 Panama Mall Stanford, CA 94305 USA

要約

A non-equilibrium boundary layer with separation, reattachment, and redevelopment is measured using a high resolution LDA for a large range of Reynolds number. The mean separation and reattachment positions are not a function of Reynolds number. The recovering boundary layer develops a stress equilibrium layer. Independent skin friction measurements confirmed that the law of the wall is valid in the redevelopment region. At separation, each of the three measured Reynolds stress components scales differently. At reattachment, none of the Reynolds stresses collapse for the given Reynolds number range. In the redevelopment region, all Reynolds stress components are scaled like a flat plate boundary layer within the stress equilibrium layer.