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Comparison Of Heat Transfer Uniformity Of A Narrow Impingement Channel
Authors
J. S. Kapat
Mark Ricklick
Publication date
1 January 2009
Publisher
'Information Bulletin on Variable Stars (IBVS)'
Abstract
Impingement channel cooling shows great potential for removing large amounts of heat from turbine airfoils. This highly efficient cooling process has the drawback, however, of yielding large gradients in heat transfer coefficients in the vicinity of the jet stagnation region. These variations can potentially lead to thermal gradients and stresses, when designed into a machine. It is therefore important to investigate not only the heat transfer performance of these channels, but the uniformity of their distributions as well. This paper examines the local and averaged effects of channel height in the presence of side walls on heat transfer coefficients and heat transfer coefficient uniformity. High resolution local temperature distributions on target and side wall surfaces were measured using temperature sensitive paint and recorded via a scientific grade charge-coupled device (CCD) camera, and compared to available literature. Streamwise pressure distributions were recorded and used to explain heat transfer trends. Results are presented for average jet based Reynolds numbers between 17,000 and 45,000. All experiments were carried out on a large scale single row, 15 hole impingement channel, with X/D of 5, Y/D of 4, and Z/D of 1, 3 and 5. Results showed that the channel with a medium channel height, and high Reynolds number yields both high heat transfer coefficients, as well as very uniform profiles. © 2009 by the American Institute of Aeronautics and Astronautics, Inc
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Last time updated on 18/10/2022