Effect of Surface Roughness on Film Cooling Performance

[+] Author and Article Information
R. J. Goldstein, E. R. G. Eckert, H. D. Chiang

Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455

E. Elovic

General Electric Company, Cincinnati, Ohio

J. Eng. Gas Turbines Power 107(1), 111-116 (Jan 01, 1985) (6 pages) doi:10.1115/1.3239669 History: Received December 27, 1983; Online October 15, 2009


An experimental investigation of film cooling on a rough surface has been performed using a mass transfer technique. Two injection geometries (one and two rows of holes) and six roughness patterns were used. The density of the injected gas was close to that of the free-stream air. The presence of roughness causes a decrease in the spanwise-averaged effectiveness for both injection geometries at low blowing rates, and an increase in the effectiveness for one-row injection at high blowing rates, but not for two-row injection. The results for two-row injection (with or without roughness) can be correlated by a parameter used to correlate slot-injection data. The influence of roughness pattern on the average effectiveness and on the lateral uniformity of the effectiveness is described.

Copyright © 1985 by ASME
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