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Open Access

Film cooling performance and flow structure of single-hole and double-holes with swirling jet

Rui ZHUa,b, Simon TERRENCEc, Shulei LIb,d, Gongnan XIEd( )
School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

Peer review under responsibility of Editorial Committee of CJA.

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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.

Keywords

Combined-holeFilm coolingInteractions of vorticesJet-in-cross-flowSwirling flow

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Chinese Journal of Aeronautics
Volume 35 Issue 3,
March 2022
Pages 201-213
DOI: 10.1016/j.cja.2021.09.021

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Cite this article:
ZHU R, TERRENCE S, LI S, et al. Film cooling performance and flow structure of single-hole and double-holes with swirling jet. Chinese Journal of Aeronautics, 2022, 35(3): 201-213. https://doi.org/10.1016/j.cja.2021.09.021

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Received: 12 January 2021
Revised: 28 February 2021
Accepted: 19 April 2021
Published: 26 October 2021
© 2021 Chinese Society of Aeronautics and Astronautics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).