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RESEARCH PAPERS

The Effects of Incident Turbulence and Moving Wakes on Laminar Heat Transfer in Gas Turbines

[+] Author and Article Information
K. Dullenkopf, R. E. Mayle

Institut für Thermische Strömungsmaschinen, Universität Karlsruhe, 76128 Karlsruhe, Germany

J. Turbomach 116(1), 23-28 (Jan 01, 1994) (6 pages) doi:10.1115/1.2928274 History: Received February 17, 1992; Online June 09, 2008

Abstract

The effect of free-stream turbulence and moving wakes on augmenting heat transfer in accelerating laminar boundary layers is considered. First, the effect of free-stream turbulence is re-examined in terms of a Nusselt number and turbulence parameter, which correctly account for the free-stream acceleration and a correlation for both cylinders in crossflow and airfoils with regions of constant acceleration is obtained. This correlation is then used in a simple quasi-steady model to predict the effect of periodically passing wakes on airfoil laminar heat transfer. A comparison of the predictions with measurements shows good agreement.

Copyright © 1994 by The American Society of Mechanical Engineers
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