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 consists of a single row of five inline jets tested at two different channel heights and over a range of engine representative Reynolds numbers. Detailed heat transfer coefficient distributions are evaluated over the complete interior surfaces of the channel using the transient liquid crystal technique. Additionally, local jet discharge coefficients are determined by probe traversing measurements for each individual jet. A 10%-increasing and a 10%-decreasing jet diameter pattern are 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.
Effect of Varying Jet Diameter on the Heat Transfer Distributions of Narrow Impingement Channels
École Polytechnique Fédérale
de Lausanne (EPFL),
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 18, 2014; final manuscript received July 19, 2014; published online September 10, 2014. Editor: Ronald Bunker.
- Views Icon Views
- Share Icon Share
- Search Site
Terzis, A., Ott, P., Cochet, M., von Wolfersdorf, J., and Weigand, B. (September 10, 2014). "Effect of Varying Jet Diameter on the Heat Transfer Distributions of Narrow Impingement Channels." ASME. J. Turbomach. February 2015; 137(2): 021004. https://doi.org/10.1115/1.4028294
Download citation file: