The overall film cooling performance of crescent holes

Qiuyin Wang; Xiaozhi Duan; Chao Zhou

doi:10.1515/tjj-2024-0008

Article

The overall film cooling performance of crescent holes

Qiuyin Wang , Xiaozhi Duan and Chao Zhou

Published/Copyright: March 26, 2024

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From the journal International Journal of Turbo & Jet-Engines Volume 41 Issue 4

Abstract

This study proposes two crescent cooling holes based on favorable vortex structures to enhance the film cooling effectiveness. Large eddy simulations and laser-induced fluorescence were conducted. An up-convex crescent hole (UCC) was established first, which uses an anti-counter-rotating vortex pair (anti-CRVP) to prevent the coolant from lifting off the surface and another CRVP to achieve better cooling uniformity at the centerline. Then, a down-convex crescent hole (DCC) was further optimized based on the vortex of the UCC. The results show that the film cooling effectiveness of the DCC increases by 48 % at BR = 1.6 compared to the UCC. Apart from the time-averaged results, the instantaneous flow field of DCC was analyzed in detail, and the distribution and breakdown of hairpin vortexes highly affect the cooling effectiveness. Besides, the heat transfer coefficient and net heat flux reduction were analyzed to overall evaluate the film cooling performance of DCC.

Keywords: coherent structure; crescent hole; film cooling; heat transfer; large eddy simulation

Corresponding author: Chao Zhou, College of Engineering, 12465 Peking University , Beijing 100871, China, E-mail: czhou@pku.edu.cn

Funding source: Natural Science Foundation of China (NSFC)

Award Identifier / Grant number: 52076001

Funding source: Natural Science Foundation of Xiamen

Award Identifier / Grant number: 3502Z202371025

Funding source: Advanced Jet Propulsion Innovation Center/AEAC

Award Identifier / Grant number: HKCX2022-01-015

Research ethics: Not applicable.
Author contributions: Q. Wang: Methodology, Software, Validation, Writing- Original draft preparation; X. Duan: Writing, Reviewing and Editing, Formal analysis; C. Zhou: Supervision, Conceptualization, Resources, Reviewing and Editing. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Competing interests: The authors state no conflict of interest.
Research funding: Natural Science Foundation of China (NSFC), (Grant No. 52076001); Natural Science Foundation of Xiamen, (Grant No.3502Z202371025); Advanced Jet Propulsion Innovation Center/AEAC, (funding number HKCX2022-01-015).
Data availability: Not applicable.

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Received: 2024-01-12

Accepted: 2024-02-17

Published Online: 2024-03-26

Published in Print: 2024-12-17

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Articles in the same Issue

https://doi.org/10.1515/tjj-2024-0008

Keywords for this article

coherent structure; crescent hole; film cooling; heat transfer; large eddy simulation