The Effect of Vortex Shedding in Film-Cooling Processes

Zhi ya Chen; Jie min Zhan; Chi wai Li; Wen qing Hu; Ye jun Gong

doi:10.1080/01457632.2020.1800260

The Effect of Vortex Shedding in Film-Cooling Processes

Zhi ya Chen, Jie min Zhan, Chi wai Li, Wen qing Hu, Ye jun Gong

Research output: Journal article publication › Journal article › Academic research › peer-review

6 Citations (Scopus)

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.

Original language	English
Journal	Heat Transfer Engineering
DOIs	https://doi.org/10.1080/01457632.2020.1800260
Publication status	Accepted/In press - 2020

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1080/01457632.2020.1800260

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title = "The Effect of Vortex Shedding in Film-Cooling Processes",

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.",

author = "Chen, {Zhi ya} and Zhan, {Jie min} and Li, {Chi wai} and Hu, {Wen qing} and Gong, {Ye jun}",

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journal = "Heat Transfer Engineering",

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AU - Chen, Zhi ya

AU - Zhan, Jie min

AU - Li, Chi wai

AU - Hu, Wen qing

AU - Gong, Ye jun

PY - 2020

Y1 - 2020

N2 - 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.

AB - 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.

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JO - Heat Transfer Engineering

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The Effect of Vortex Shedding in Film-Cooling Processes

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