Effect of double rows of film holes interaction on film cooling efficiency

LIN Zeqin; WEN Tao; WANG Yuqing

doi:10.19666/j.rlfd.202307117

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Effect of double rows of film holes interaction on film cooling efficiency

更新时间：2025-09-28

- Effect of double rows of film holes interaction on film cooling efficiency
- Thermal Power Generation Vol. 53, Issue 2, Pages: 78-85(2024)
- 作者机构：
  
  1. 华中科技大学机械科学与工程学院
  2. 广东理工职业学院机器人学院
  3. 太原理工大学机械与运载工程学院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202307117
  CLC： TM621
- Published：2024
- 稿件说明：
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LIN Zeqin, WEN Tao, WANG Yuqing. Effect of double rows of film holes interaction on film cooling efficiency[J]. Thermal power generation, 2024, 53(2): 78-85.
DOI：

LIN Zeqin, WEN Tao, WANG Yuqing. Effect of double rows of film holes interaction on film cooling efficiency[J]. Thermal power generation, 2024, 53(2): 78-85. DOI： 10.19666/j.rlfd.202307117.

摘要

采用高精度红外热像仪测量了平板气膜冷却效率，比较了双叉排孔和单排孔气膜冷却效率，分析了孔间的相互作用，以及吹风比（M=0.65、1.00、1.50）和密度比（DR=1.0

1.5）对气膜冷却效率的影响；同时还采用数值计算方法比较了气膜冷却下的流场。结果表明：单排气膜孔冷却效率随着吹风比的增加而降低，但是双叉排气膜孔冷却效率大大提高，且随着吹风比的增加而增加，但是在展向气膜覆盖效果变差；增加密度比可以提高气膜冷却效率，但是双叉排孔和吹风比的影响相对密度比更大；双叉排孔相比于单排孔，冷却气流在孔下游形成了反肾形涡，较好抑制了气膜吹离。

Abstract

The cooling efficiency of flat film was measured using a high-precision infrared thermal imager

and the film cooling efficiency between double-cross-row holes and single row holes is compared. The interaction between film holes and the influence of blowing ratio(M=0.65

1.0

1.5) and density ratio(DR=1.0

1.5) on the cooling efficiency was analyzed. Moreover

the flow field with film cooling was compared using numerical calculation methods. The results show that

with the increase of the blowing ratio

the cooling efficiency of the single row holes decreases while that of the double-cross-row holes improved greatly

but the film coverage effect at the spanwise direction deteriorates. Increasing the density ratio will improve the cooling performance. However

the influence of double rows of film holes and blow ratio is much higher on the cooling effectiveness

compared with the density ratio. For the double rows of film holes cooling

the cooling jet forms a reverse kidney-shaped vortex downstream of the holes

which will prevent the jet blowing away from the cooling wall.

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