Heat Transfer and Film Cooling Following Injection Through Inclined Circular Tubes

[+] Author and Article Information
V. L. Eriksen

Research and Development, Harrison Radiator Division, General Motors Corp., Lockport, N. Y.

R. J. Goldstein

School of Mechanical and Aerospace Engineering, University of Minnesota, Minneapolis, Minn.

J. Heat Transfer 96(2), 239-245 (May 01, 1974) (7 pages) doi:10.1115/1.3450171 History: Received July 19, 1973; Online August 11, 2010


Film cooling effectiveness and heat transfer are measured downstream of injection through discrete holes into a turbulent mainstream boundary layer. Air is injected through both a single hole and a row of holes spaced at three-diameter intervals and inclined at an angle of 35 deg to the main flow. There is little difference between the heat transfer coefficient with blowing and without blowing at low blowing rates (mass flux ratios). In fact, at low blowing rates, injection is found to decrease somewhat the heat transfer coefficient from that measured without blowing. As the mass flux ratio increases past unity, the heat transfer coefficient increases especially with injection through a row of holes. The peak heat transfer is usually found at the edge of the spreading jets (i.e., between two holes). At a blowing rate near two, the lateral average of the heat transfer is as much as 27 percent higher than the heat transfer with no blowing. The increase in heat transfer is attributed to the interaction between the jets and the free stream, causing high levels of turbulence.

Copyright © 1974 by ASME
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