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.
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January 1985
Research Papers
Effect of Surface Roughness on Film Cooling Performance
R. J. Goldstein,
R. J. Goldstein
Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455
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E. R. G. Eckert,
E. R. G. Eckert
Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455
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H. D. Chiang,
H. D. Chiang
Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455
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E. Elovic
E. Elovic
General Electric Company, Cincinnati, Ohio
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R. J. Goldstein
Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455
E. R. G. Eckert
Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minn. 55455
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. Jan 1985, 107(1): 111-116 (6 pages)
Published Online: January 1, 1985
Article history
Received:
December 27, 1983
Online:
October 15, 2009
Citation
Goldstein, R. J., Eckert, E. R. G., Chiang, H. D., and Elovic, E. (January 1, 1985). "Effect of Surface Roughness on Film Cooling Performance." ASME. J. Eng. Gas Turbines Power. January 1985; 107(1): 111–116. https://doi.org/10.1115/1.3239669
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