Numerical study on cooling effect of gas film with compound angle injection on the endwall

ZHANG Ling; ZHU Jian; HAN Jianing

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Numerical study on cooling effect of gas film with compound angle injection on the endwall

Thermal Power Generation Vol. 44, Issue 3, Pages: 58-62(2015)

更新时间：2025-09-28

- Numerical study on cooling effect of gas film with compound angle injection on the endwall
- 作者机构：
  
  1. 东北电力大学能源与动力工程学院
  2. 内蒙古岱海发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK14
- Published：2015
- 稿件说明：
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ZHANG Ling, ZHU Jian, HAN Jianing. Numerical study on cooling effect of gas film with compound angle injection on the endwall[J]. Thermal Power Generation, 2015, 44(3): 58-62.
DOI：

ZHANG Ling, ZHU Jian, HAN Jianing. Numerical study on cooling effect of gas film with compound angle injection on the endwall[J]. Thermal Power Generation, 2015, 44(3): 58-62. DOI：

摘要

采用CFD方法在叶栅端壁21%

51%

81%轴向弦长和前缘上游9%轴向弦长端壁处布置4排圆柱形气膜冷却孔

选用标准κ-ε模型模拟分析端壁单一角度与复合角度射流的冷却效果。结果表明:复合角度射流优势在入射角α=30°时最明显

此时复合角度射流平均冷却效率比单一角度射流平均冷却效率增加16.4%;随着吹风比增加

射流孔附近冷却效率下降速度变慢;复合角度射流的引入会导致反向涡不对称

加强了气膜的贴壁性

更有利于汽膜冷却。

Abstract

Four rows of cylinder film cooling holes were allocated at the turbine cascade endwall with axial blade chord of 21%

51% and 81% and upstream of leading edge of 9%

by the CFD method. The standard k-ε turbulence model was applied to simulate cooling effect of the endwall with single angle and compound angle film-holes.The results show that

the advantage of compound angle jet could be well demonstrated when the incidence angle αreached 30°

at which time the average cooling efficiency of the compound angle jet was 16. 4% higher than that of the single angle jet. With an increase in blowing rate

the cooing efficiency drop was getting slower. The compound angle jet will cause reverse asymmetric vortexes

which strengthens the wall-attachment of the film to some extent and is helpful to the steam film cooling.

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