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RESEARCH PAPERS

Heat Transfer Committee and Turbomachinery Committee Best Paper of 1996 Award: The Path to Predicting Bypass Transition

[+] Author and Article Information
R. E. Mayle, A. Schulz

Institut für Thermische Strömungsmaschinen, Universität Karlsruhe, Karlsruhe, Federal Republic of Germany

J. Turbomach 119(3), 405-411 (Jul 01, 1997) (7 pages) doi:10.1115/1.2841138 History: Received February 01, 1996; Online January 29, 2008

Abstract

A theory is presented for calculating the fluctuations in a laminar boundary layer when the free stream is turbulent. The kinetic energy equation for these fluctuations is derived and a new mechanism is revealed for their production. A methodology is presented for solving the equation using standard boundary layer computer codes. Solutions of the equation show that the fluctuations grow at first almost linearly with distance and then more slowly as viscous dissipation becomes important. Comparisons of calculated growth rates and kinetic energy profiles with data show good agreement. In addition, a hypothesis is advanced for the effective forcing frequency and free-stream turbulence level that produce these fluctuations. Finally, a method to calculate the onset of transition is examined and the results compared to data.

Copyright © 1997 by The American Society of Mechanical Engineers
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