Measurements in Film Cooling Flows: Hole L/D and Turbulence Intensity Effects

[+] Author and Article Information
S. W. Burd, R. W. Kaszeta, T. W. Simon

Heat Transfer Laboratory, University of Minnesota, Minneapolis, MN 55455

J. Turbomach 120(4), 791-798 (Oct 01, 1998) (8 pages) doi:10.1115/1.2841791 History: Received September 01, 1997; Online January 29, 2008


Hot-wire anemometry measurements of simulated film cooling are presented to document the influence of the free-stream turbulence intensity and film cooling hole length-to-diameter ratio on mean velocity and on turbulence intensity. Measurements are taken in the zone where the coolant and free-stream flows mix. Flow from one row of film cooling holes with a streamwise injection of 35 deg and no lateral injection and with a coolant-to-free-stream flow velocity ratio of 1.0 is investigated under free-stream turbulence levels of 0.5 and 12 percent. The coolant-to-free-stream density ratio is unity. Two length-to-diameter ratios for the film cooling holes, 2.3 and 7.0, are tested. The Measurements document that under low free-stream turbulence conditions pronounced differences exist in the flowfield between L/D= 7.0 and 2.3. The difference between L/D cases are less prominent at high free-stream turbulence intensities. Generally, Short-L/D injection results in “jetting” of the coolant farther into the free-stream flow and enhanced mixing. Other changes in the flowfield attributable to a rise in free-stream turbulence intensity to engine-representative conditions are documented.

Copyright © 1998 by The American Society of Mechanical Engineers
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