Effect of Acceleration on the Heat Transfer Coefficient on a Film-Cooled Surface

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

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

J. Turbomach 113(3), 464-471 (Jul 01, 1991) (8 pages) doi:10.1115/1.2927897 History: Received January 05, 1990; Online June 09, 2008


Results are presented of an experimental investigation into the influence of mainstream acceleration on the heat transfer coefficient downstream of injection through a row of 35 deg holes in a flat plate. A mass transfer analogue technique was used, with two uniform acceleration parameters, K ( = v(du∞ /dx)/u2 ∞ , of 1.9 × 10−6 and 5.0×10−6 in addition to the zero acceleration baseline case. Two injectants, air and carbon dioxide, were employed to give coolant-to-mainstream density ratios of 1.0 and 1.52, respectively. The blowing rate varied from 0.5 to 2.0. The heat transfer coefficient beneath the film decreased progressively as the acceleration increased, with maximum reductions from the zero acceleration datum case of about 27 percent. In the presence of acceleration, the heat transfer coefficient at a given blowing rate was dependent on the density ratio, an increase in the density ratio leading to a decrease in the heat transfer coefficient. An empirical correlation of the data over most of the range of densities and blowing rates of the experiments has been developed.

Copyright © 1991 by The American Society of Mechanical Engineers
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