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.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4571-4
PROCEEDINGS PAPER
Detailed Heat Transfer Distributions of Narrow Impingement Channels With Varying Jet Diameter
Alexandros Terzis,
Alexandros Terzis
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Jens von Wolfersdorf,
Jens von Wolfersdorf
University of Stuttgart, Stuttgart, Germany
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Bernhard Weigand,
Bernhard Weigand
University of Stuttgart, Stuttgart, Germany
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Peter Ott
Peter Ott
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
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Alexandros Terzis
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Magali Cochet
Alstom, Baden, Switzerland
Jens von Wolfersdorf
University of Stuttgart, Stuttgart, Germany
Bernhard Weigand
University of Stuttgart, Stuttgart, Germany
Peter Ott
École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Paper No:
GT2014-25910, V05AT12A028; 11 pages
Published Online:
September 18, 2014
Citation
Terzis, A, Cochet, M, von Wolfersdorf, J, Weigand, B, & Ott, P. "Detailed Heat Transfer Distributions of Narrow Impingement Channels With Varying Jet Diameter." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 5A: Heat Transfer. Düsseldorf, Germany. June 16–20, 2014. V05AT12A028. ASME. https://doi.org/10.1115/GT2014-25910
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