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RESEARCH PAPERS

Effects of the Condition of the Approach Boundary Layer and of Mainstream Pressure Gradients on the Heat Transfer Coefficient on Film-Cooled Surfaces

[+] Author and Article Information
N. Hay, D. Lampard, C. L. Saluja

Department of Mechanical Engineering, University of Nottingham, Nottingham NG7 2RD England

J. Eng. Gas Turbines Power 107(1), 99-104 (Jan 01, 1985) (6 pages) doi:10.1115/1.3239703 History: Received December 27, 1983; Online October 15, 2009

Abstract

This paper describes an investigation of the sensitivity of the heat transfer coefficient under the film to the state of the approach boundary layer for injection through a row of holes on a flat plate. The investigation is done for a range of blowing parameters using a heat-mass transfer analogy. Injection angles of 35 deg and 90 deg are covered. Additionally, for the same injection geometries, the effect of injection in the presence of mild adverse, mild favorable, and strong favorable mainstream pressure gradients is investigated. The results indicate that the heat transfer coefficient under the film is sensitive neither to the condition of the approach boundary layer nor to the presence of a mild adverse pressure gradient, but it is significantly lowered by a favorable pressure gradient, particularly at low blowing parameters.

Copyright © 1985 by ASME
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