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The Effect of Vortex Shedding in Film-Cooling Processes
Heat Transfer Engineering ( IF 1.6 ) Pub Date : 2020-08-05 , DOI: 10.1080/01457632.2020.1800260
Zhi-ya Chen 1 , Jie-min Zhan 1 , Chi-wai Li 2 , Wen-qing Hu 1 , Ye-jun Gong 1
Affiliation  

Abstract

Film cooling using coolant jets is effective for increasing the cooling effectiveness of turbines. In the present study, large eddy simulation was employed for predicting small-scale vortices in the film-cooling process with different blowing ratios (BRs). The counter-rotating vortex pair (CRVP) was compared with the hairpin vortex, and results indicated the CRVP was the cross section of hairpin vortex. The results of a spectral analysis indicated a high correlation between the shedding period of the CRVP and the film-cooling effectiveness, and the dominant frequencies of the temperature and vorticity spectra were both identical to the shedding frequency of the CRVP when BR is less than 0.75. Furthermore, a higher shedding frequency of CRVP will suck the hot cross-flow into the core region more frequently, which will lead to a worse film-cooling effectiveness.



中文翻译:

薄膜冷却过程中涡流脱落的影响

摘要

使用冷却剂射流的薄膜冷却对于提高涡轮机的冷却效率是有效的。在本研究中,采用大涡模拟来预测不同吹塑比 (BR) 薄膜冷却过程中的小尺度涡流。将反向旋转涡对(CRVP)与发夹涡进行比较,结果表明 CRVP 是发夹涡的横截面。谱分析结果表明,CRVP的脱落周期与膜冷却效率之间存在高度相关性,当BR小于0.75时,温度谱和涡度谱的主频均与CRVP的脱落频率相同. 此外,较高的 CRVP 脱落频率会更频繁地将热横流吸入核心区域,

更新日期:2020-08-05
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