Heat Transfer With Very High Free-Stream Turbulence: Part I—Experimental Data

[+] Author and Article Information
P. K. Maciejewski

Mechanical Engineering Department, University of Pittsburgh, Pittsburgh, PA 15261

R. J. Moffat

Department of Mechanical Engineering, Stanford University, Stanford, CA 94305

J. Heat Transfer 114(4), 827-833 (Nov 01, 1992) (7 pages) doi:10.1115/1.2911889 History: Received April 01, 1991; Revised April 01, 1992; Online May 23, 2008


The present research investigates boundary layer heat transfer with very high freestream turbulence, a problem of primary interest in the gas turbine industry where existing boundary layer correlations and codes underpredict local heat transfer rates on first-stage turbine blades and vanes by as much as a factor of three for some engine designs. The problem was studied experimentally by placing a constant-temperature heat transfer surface at various locations in the margin of a turbulent free jet and measuring both the surface heat transfer rate and the turbulence in the free stream. In this experiment, free-stream turbulent fluctuations 20 to 60 percent relative to the mean velocity augment heat transfer 1.8 to 4 times that which would be predicted locally using accepted correlations for turbulent boundary layers at the same Reynolds number.

Copyright © 1992 by The American Society of Mechanical Engineers
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