The Effect of Vortex Shedding in Film-Cooling Processes

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...

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Bibliographic Details
Published in:Heat transfer engineering 2021-06, Vol.42 (17), p.1432-1451
Main Authors: Chen, Zhi-ya, Zhan, Jie-min, Li, Chi-wai, Hu, Wen-qing, Gong, Ye-jun
Format: Article
Language:English
Subjects:
Cooling
Cross flow
Film cooling
Fluid dynamics
Fluid flow
Horseshoe vortices
Large eddy simulation
Spectrum analysis
Turbines
Vortex shedding
Vortices
Vorticity
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Summary: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.
ISSN:0145-7632
1521-0537
DOI:10.1080/01457632.2020.1800260