Film cooling performance and flow structure of single-hole and double-holes with swirling jet |
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| Authors: | Rui ZHU Simon TERRENCE Shulei LI Gongnan XIE |
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| Institution: | 1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China;3. Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA;4. School of Marine Science and Technology, Northwestern Polytechnical University, Xi''an 710072, China |
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| Abstract: | This paper presents the results of a numerical study of the effects of swirling flow in coolant jets on film cooling performance. Some combined-hole designs with swirling coolant flow entering the delivery hole are proposed and analyzed. Adiabatic film cooling effectiveness values for cases with various blowing ratios are compared. Detailed flow structures and underlying mechanisms are discussed. The results show that film cooling effectiveness is improved with jet swirl at high blowing ratios, and that swirl strength has significant influence on film cooling performance. Combined-hole designs can further improve film cooling performance using swirling jets due to mixing of coolant flows and interaction of vortices. The largest improvements of area-averaged film cooling effectiveness for a single-hole swirl case and a combined-hole swirl case over corresponding non-swirling case results are 157% and 173%, respectively. |
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| Keywords: | Combined-hole Film cooling Interactions of vortices Jet-in-cross-flow Swirling flow |
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