Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity

doi:10.7652/xjtuxb201707003

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Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity

更新时间：2025-07-09

- Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity
- Vol. 51, Issue 7, Pages: 16-23(2017)
- 作者机构：
  
  西安建筑科技大学机电工程学院,西安,710055
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201707003
  CLC： V231.3
- Online First：10 July 2017，
  
  Published：2017
- 稿件说明：
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Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity[J]. 2017, 51(7): 16-23.
DOI：

Experimental Study on the Film Cooling Performance of Odd-Shaped Film Holes with Large Inclination Angle under High Turbulence Intensity[J]. 2017, 51(7): 16-23. DOI： 10.7652/xjtuxb201707003.

摘要

为了研究高主流湍流度下大倾斜角异型气膜孔的冷却特性

在主流湍流度为11.82%的流动工况下

采用瞬态液晶传热测量技术对倾斜角均为60°的圆柱孔、水滴孔以及曲面簸箕孔进行了研究。在吹风比为0.5的工况下

3种孔型的气膜贴壁性都较好

上游冷却效率高于下游; 在吹风比为1.0的工况下

圆柱孔和水滴孔出现气膜脱离壁面再附着现象

上游冷却效率低于下游; 在更大吹风比下

曲面簸箕孔气膜也出现脱离再附着现象。吹风比的增加会显著增强各个气膜孔的对流换热强度

曲面簸箕孔的换热系数比在各个吹风比下都低于圆柱孔和水滴孔

圆柱孔和水滴孔的换热系数比在上游区域较高

而曲面簸箕孔的换热系数比在大吹风比下呈现出先上升后下降的分布特征。实验结果表明

在高主流湍流度条件下

大倾斜角水滴孔和圆柱孔的气膜冷却效果相近

曲面簸箕孔的气膜冷却效果优于这两种孔型。

Abstract

In order to obtain the film cooling characteristics of odd-shaped film holes with large inclination angle under high mainstream turbulence intensity

three film hole configurations with an inclination angle of 60°

including cylindrical hole

water-drop hole and curved dustpan hole

were studied under the mainstream turbulence intensity of 11.82% using transient liquid crystal measurement technique. At a blowing ratio of 0.5

the film attachment behavior on the wall is good for all the three hole configurations

and the film cooling efficiency in upstream region is higher than that in downstream region. At a blowing ratio of 1.0

the film jets lift off from the wall for the cylindrical hole and water-drop hole

resulting in lower film cooling efficiency in upstream region. With further increase of blowing ratio

the film jets of the curved dustpan hole also lift off from the wall. The increase of blowing ratio will obviously enhance the heat transfer intensity for all the three hole configurations. The heat transfer coefficient ratio of the cylindrical hole and water-drop hole decreases gradually along the streamwise direction. And the heat transfer coefficient ratio of the curved dustpan hole is lower than that of the cylindrical hole and water-drop hole under all blowing ratios

and has an undulation feature at large blowing ratios. The above results indicate that the film cooling performance of the curved dustpan hole is better than that of the cylindrical hole and water-drop hole under all blowing ratios

but the film cooling performance of the cylindrical hole and water-drop hole with large inclination angles is close to each other.

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references

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