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RESEARCH PAPERS

Film Cooling From Spanwise-Oriented Holes in Two Staggered Rows

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

Convective Heat Transfer Laboratory, 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(3), 562-567 (Jul 01, 1997) (6 pages) doi:10.1115/1.2841158 History: Received February 04, 1995; Online January 29, 2008

Abstract

Adiabatic effectiveness and iso-energetic heat transfer coefficients are presented from measurements downstream of film-cooling holes inclined at 30 deg. with respect to the test surface in spanwise/normal planes. With this configuration, holes are spaced 3d apart in the spanwise direction and 4d in the streamwise direction in two staggered rows. Results are presented for an injectant to free-stream density ratio near 1.0, and injection blowing ratios from 0.5 to 1.5. Spanwise-averaged adiabatic effectiveness values downstream of the spanwise/normal plane holes are significantly higher than values measured downstream of simple angle holes for x/d < 25–70(depending on blowing ratio) when compared for the same normalized streamwise location, blowing ratio, and spanwise and streamwise hole spacings. Spanwise-averaged iso-energetic Stanton number ratios range between 1.0 and 1.41, increase with blowing ratio at each streamwise station, and show little variation with streamwise location for each value of blowing ratio tested.

Copyright © 1997 by The American Society of Mechanical Engineers
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