Investigation of the Heat-Island Effect for Heat-Flux Measurements in Short-Duration Facilities

[+] Author and Article Information
M. G. Dunn

Gas Turbine Laboratory, The Ohio State University, Columbus, OH 43235

J. Kim

Dept. of Engineering, University of Denver, Denver, CO 80208

W. J. Rae

Dept. of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, NY 14260

J. Turbomach 119(4), 753-760 (Oct 01, 1997) (8 pages) doi:10.1115/1.2841185 History: Received July 01, 1997; Online January 29, 2008


This paper presents the results of an experimental investigation designed to determine the possible influence of a surface-temperature discontinuity on the heat-flux history inferred from the temperature history of a miniature thin-film heat-flux gage (painted on an insulator) embedded in the surface of a metallic component. The resulting surface material discontinuity has the potential of causing a heat-island effect. Simultaneous measurements of the heat-flux history at selected locations along the midspan of a representative turbine airfoil (metal) were performed using continuous strip-type contoured inserts (without temperature discontinuity) and button-type inserts (with temperature discontinuity). Measurements are reported for two Reynolds number conditions. The experimental results suggest that for the experimental conditions of interest to gas turbine research in short-duration facilities, the influence of a potential heat-island on the measured heat flux is insignificant.

Copyright © 1997 by The American Society of Mechanical Engineers
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