Film cooling performance and flow resistance characteristics of single/triple⁃row fan⁃shaped holes based on actual density ratio

Hong WEI; Yingqing ZU

doi:10.13224/j.cnki.jasp.20210306

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Film cooling performance and flow resistance characteristics of single/triple⁃row fan⁃shaped holes based on actual density ratio

Combustion, Heat and Mass Transfer | 更新时间：2025-04-07

- Film cooling performance and flow resistance characteristics of single/triple⁃row fan⁃shaped holes based on actual density ratio
- Journal of Aerospace Power Vol. 36, Issue 11, Pages: 2331-2343(2021)
- 作者机构：
  
  1.复旦大学航空航天系，上海 200433
  2.上海交通大学机械与动力工程学院，上海 200240
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20210306
  CLC：
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Hong WEI, Yingqing ZU. Film cooling performance and flow resistance characteristics of single/triple⁃row fan⁃shaped holes based on actual density ratio[J]. Journal of Aerospace Power, 2021, 36(11): 2331-2343.
DOI：

Hong WEI, Yingqing ZU. Film cooling performance and flow resistance characteristics of single/triple⁃row fan⁃shaped holes based on actual density ratio[J]. Journal of Aerospace Power, 2021, 36(11): 2331-2343. DOI： 10.13224/j.cnki.jasp.20210306.

摘要

在真实密度比条件下对单排和三排的扇形气膜孔的传热和流阻特性进行了实验研究。采用压敏漆（PSP）技术对单/三排定出口宽度的扇形孔进行风洞实验，研究了在真实密度比条件下不同孔形参数的扇形气膜孔的传热和流阻特性的差异，得到了不同孔形参数的扇形孔出现冷气射流吹离热侧壁面的大致临界吹风比以及实现展向平均气膜冷却效率最高的孔型结构参数。实验结果表明：在所研究的孔形参数范围内，扇形孔在吹风比小于1.5时没有出现冷气射流吹离壁面的现象，且倾斜角为20°、扩散角为15°的扇形孔的气膜冷却性能最好；而当吹风比为2.0时则出现了不同程度的吹离热侧壁面的现象，且倾斜角为25°、扩散角为10°的扇形孔的气膜冷却效率最大。此外，倾斜角为25°、扩散角为13°和倾斜角为30°、扩散角为10°的扇形孔流量系数最高。

Abstract

The heat transfer and flow resistance characteristics of single/triple⁃row of fan⁃shaped film cooling holes under the condition of true density ratio were experimentally studied.The pressure⁃sensitive paint （PSP） technology was used in the wind tunnel to test the film cooling performance of the fan⁃shaped holes with a constant outlet width，and the differences in heat transfer and flow resistance characteristics of fan⁃shaped film cooling holes with different hole shape parameters under the condition of real density ratio were studied.The hole shape parameters of fan⁃shaped holes implementing the critical blowing ratio of the coolant jet blowing away from the hot⁃side wall surface and the hole shape parameters with highest span⁃wise average film cooling effectiveness were obtained.The experimental results indicated that：within the range of hole shape parameters studied，for fan⁃shaped holes，when blowing ratio was less than 1.5，the coolant jet wasn't blown away from the hot⁃side wall surface，and the film cooling performance of the fan⁃shaped hole with inclination angle of 20° and diffusion angle of 15° was the best.However，when blowing ratio equaled to 2.0，partial coolant jet was blown away from the hot⁃side surface，the film cooling effectiveness of the fan⁃shaped hole with inclination angle of 25° and diffusion angle of 10° was the largest.In addition，the discharge coefficients of the fan⁃shaped holes with inclination angle of 25° and diffusion angle of 13° and those of the fan⁃shaped hole with inclination angle of 30° and diffusion angle of 10° were the highest.

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references

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