Film Cooling From a Single Row of Holes Oriented in Spanwise/Normal Planes

[+] Author and Article Information
P. M. Ligrani

Department of Mechanical Engineering, University of Utah, Salt Lake City, UT 84112

A. E. Ramsey

Department of Mechanical Engineering, Naval Postgraduate School, Monterey, CA 93943

J. Turbomach 119(4), 770-776 (Oct 01, 1997) (7 pages) doi:10.1115/1.2841187 History: Received October 01, 1996; Online January 29, 2008


Experimental results are presented that describe the development and structure of flow downstream of a single row of film-cooling holes inclined at 30 deg from the test surface in spanwise/normal planes. With this configuration, holes are spaced 6d apart in the spanwise direction in a single row. Results are presented for a ratio of injectant density to free-stream density near 1.0, and injection blowing ratios from 0.5 to 1.5. Compared to results measured downstream of simple angle (streamwise) oriented holes, spanwise-averaged adiabatic effectiveness values are significantly higher for the same spanwise hole spacing, normalized streamwise location x/d, and blowing ratio m when m = 1.0 and 1.5 for x/d < 80. The injectant from the spanwise/normal holes is also less likely to lift off of the test surface than injectant from simple angle holes. This is because lateral components of momentum keep higher concentrations of injectant in closer proximity to the surface. As a result, local adiabatic effectiveness values show significantly greater spanwise variations and higher local maxima at locations immediately downstream of the holes. Spanwise-averaged iso-energetic Stanton number ratios range between 1.07 and 1.26, which are significantly higher than values measured downstream of two other injection configurations (one of which is simple angle, streamwise holes) when compared at the same x/d and blowing ratio.

Copyright © 1997 by The American Society of Mechanical Engineers
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