Full Surface Local Heat Transfer Coefficient Measurements in a Model of an Integrally Cast Impingement Cooling Geometry

[+] Author and Article Information
D. R. H. Gillespie, Z. Wang, P. T. Ireland

Dept. of Engineering Science, University of Oxford, Oxford, United Kingdom

S. T. Kohler

Rolls Royce, Bristol, United Kingdom

J. Turbomach 120(1), 92-99 (Jan 01, 1998) (8 pages) doi:10.1115/1.2841394 History: Received February 01, 1996; Online January 29, 2008


Cast impingement cooling geometries offer the gas turbine designer higher structural integrity and improved convective cooling when compared to traditional impingement cooling systems, which rely on plate inserts. In this paper, it is shown that the surface that forms the jets contributes significantly to the total cooling. Local heat transfer coefficient distributions have been measured in a model of an engine wall cooling geometry using the transient heat transfer technique. The method employs temperature-sensitive liquid crystals to measure the surface temperature of large-scale perspex models during transient experiments. Full distributions of local Nusselt number on both surfaces of the impingement plate, and on the impingement target plate, are presented at engine representative Reynolds numbers. The relative effects of the impingement plate thermal boundary condition and the coolant supply temperature on the target plate heat transfer have been determined by maintaining an isothermal boundary condition at the impingement plate during the transient tests. The results are discussed in terms of the interpreted flow field.

Copyright © 1998 by The American Society of Mechanical Engineers
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