Detailed Heat Transfer Distributions of Narrow Impingement Channels with Varying Jet Diameter

The development of integrally cast turbine airfoils allows the production of narrow impingement channels in a double-wall configuration, where the coolant is practically injected within the wall of the airfoil providing increased heat transfer capabilities. This study examines the cooling performance of narrow impingement channels with varying jet diameters using a single exit design in an attempt to regulate the generated crossflow. The channel consist of a single row of five inline jets tested at two different channel heights and over a range of Reynolds numbers. Detailed heat transfer coefficient distributions are evaluated over the complete interior surfaces of the channel using the transient liquid crystal technique. Local jet discharge coefficients are determined by probe traversing measurements for each individual jet. A 10%-increasing and a 10%-decreasing jet diameter pattern is compared with a baseline geometry of uniform jet size distribution indicating a considerable effect of varying jet diameter on the heat transfer level and the development of the generated crossflow.

Published in:
Proceedings of ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT2014-25910, 1-11
Presented at:
GT-2014: ASME Turbo Expo 2014, Düsseldorf, D, June 16-20, 2014

Note: The status of this file is: EPFL only

 Record created 2014-06-12, last modified 2020-10-25

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