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research-article

Effect of Internal Crossflow Velocity on Film Cooling Effectiveness – Part II: Compound Angle Shaped Holes

[+] Author and Article Information
John W. McClintic

The University of Texas at Austin 204 E. Dean Keeton St, Austin, TX 78712
johnwmcclintic@gmail.com

Joshua B. Anderson

The University of Texas at Austin 204 E. Dean Keeton St, Austin, TX 78712
mranderson@utexas.edu

David G. Bogard

The University of Texas at Austin 204 E. Dean Keeton St, Austin, TX 78712
dbogard@mail.utexas.edu

Thomas E. Dyson

GE Global Research Center 1 Research Circle, Schenectady, NY 12309
dyson@ge.com

Zachary D. Webster

GE Aviation 1 Neumann Way, Cincinnati, OH 45125
zachary.webster@ge.com

1Corresponding author.

ASME doi:10.1115/1.4037998 History: Received August 21, 2017; Revised September 05, 2017

Abstract

In gas turbine engines, film cooling holes are commonly fed with an internal crossflow, the magnitude of which has been shown to have a notable effect on film cooling effectiveness. In Part I of this study, as well as in a few previous studies, the magnitude of internal crossflow velocity was shown to have a substantial effect on film cooling effectiveness of axial shaped holes. There is, however, almost no data available in the literature that shows how internal crossflow affects compound angle shaped film cooling holes. In Part II, film cooling effectiveness, heat transfer coefficient augmentation, and discharge coefficients were measured for a single row of compound angle shaped film cooling holes fed by internal crossflow flowing both in-line and counter to the span-wise direction of coolant injection. The crossflow-to-mainstream velocity ratio was varied from 0.2-0.6 and the injection velocity ratio was varied from 0.2-1.7. It was found that increasing the magnitude of the crossflow velocity generally caused degradation of the film cooling effectiveness, especially for in-line crossflow. An analysis of jet characteristic parameters demonstrated the importance of crossflow effects relative to the effect of varying the film cooling injection rate. Heat transfer coefficient augmentation was found to be primarily dependent on injection rate, although for in-line crossflow, increasing crossflow velocity significantly increased augmentation for certain conditions.

Copyright (c) 2017 by ASME
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