A double swirl cooling method has been raised recently to enhance the internal cooling performance at the blade leading edge. This paper mainly focuses on investigating the flow and heat transfer characteristics of the double swirl cooling method. Further more, four kinds of elliptical holes are applied to show effects of impinging hole shapes on the cooling performance. Results of all double swirl cooling cases are compared with that of an impingement cooling structure under four Reynolds numbers. Overall averaged Nusselt number, friction factor and thermal performance factor are compared in all cases, Vortexes induced by different impinging hole types and target chambers are studied and compared. The spanwise averaged Nusselt number, Nusselt number contours and Nusselt number distributions at several cross sections are studied and compared. Results show that the double swirl cooling method can significantly enhance the heat transfer performance compared with the traditional impingement cooling structure. Double swirl cooling with cylindrical impinging hole shows the best thermal performance and lowest flow losses. By applying the elliptical impinging hole with the sharp side faced the mainstream flow direction and a larger major to minor axis length ratio, the rotational vortex inside the double swirl chamber can be better developed and the heat transfer performance is also promoted.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5108-1
PROCEEDINGS PAPER
Effects of Impinging Hole Shapes on Double Swirl Cooling Performance at Gas Turbine Blade Leading Edge
Junfei Zhou,
Junfei Zhou
Xi'an Jiaotong University, Xi'an, China
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Xinjun Wang,
Xinjun Wang
Xi'an Jiaotong University, Xi'an, China
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Daren Zheng
Daren Zheng
Xi'an Jiaotong University, Xi'an, China
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Junfei Zhou
Xi'an Jiaotong University, Xi'an, China
Xinjun Wang
Xi'an Jiaotong University, Xi'an, China
Jun Li
Xi'an Jiaotong University, Xi'an, China
Daren Zheng
Xi'an Jiaotong University, Xi'an, China
Paper No:
GT2018-75445, V05AT11A003; 13 pages
Published Online:
August 30, 2018
Citation
Zhou, J, Wang, X, Li, J, & Zheng, D. "Effects of Impinging Hole Shapes on Double Swirl Cooling Performance at Gas Turbine Blade Leading Edge." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 5A: Heat Transfer. Oslo, Norway. June 11–15, 2018. V05AT11A003. ASME. https://doi.org/10.1115/GT2018-75445
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