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RESEARCH PAPERS

Discharge Coefficient of Turbine Cooling Holes: A Review

[+] Author and Article Information
N. Hay, D. Lampard

Department of Mechanical Engineering, University of Nottingham, Nottingham, United Kingdom

J. Turbomach 120(2), 314-319 (Apr 01, 1998) (6 pages) doi:10.1115/1.2841408 History: Received February 01, 1996; Online January 29, 2008

Abstract

Published information on the discharge coefficient of film cooling holes is classified in terms of the hole geometry, the external flow conditions at inlet and outlet, and the method of evaluation. This may be either theoretical or experimental. The information is reviewed primarily in the context of its use for evaluating discharge coefficients for conditions not directly covered by published data. It is shown that potential flow analyses can give acceptable accuracy for simple geometries with crossflows, while more complex cases require the use of correlated data, which may be incorporated in a range of predictive schemes. Deficiencies and inconsistencies in the published information are highlighted, and future developments are discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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