带槽双射流气膜冷却数值研究

廖高良; 王新军; 李军

doi:10.7652/xjtuxb201403007

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带槽双射流气膜冷却数值研究

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- 带槽双射流气膜冷却数值研究
- Numerical Investigation to Double-Jet Film-Cooling with Trench
- 西安交通大学学报 2014年48卷第3期页码：34-38+127
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403007
  中图分类号： TK474.7
- 网络首发：2014-03-10，
  
  纸质出版：2014
- 稿件说明：
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廖高良, 王新军, 李军. 带槽双射流气膜冷却数值研究[J]. 西安交通大学学报, 2014,48(3):34-38+127.

Numerical Investigation to Double-Jet Film-Cooling with Trench[J]. 2014, 48(3): 34-38+127.
廖高良, 王新军, 李军. 带槽双射流气膜冷却数值研究[J]. 西安交通大学学报, 2014,48(3):34-38+127. DOI： 10.7652/xjtuxb201403007.

Numerical Investigation to Double-Jet Film-Cooling with Trench[J]. 2014, 48(3): 34-38+127. DOI： 10.7652/xjtuxb201403007.

摘要

针对双射流气膜冷却在提高气膜冷却效率中存在横向冷却效果不佳的问题

提出了一种带槽结构的双射流气膜冷却方式

即在气膜孔出口处垂直于流向横开一槽

并在平均吹风比为1.9时

采用CFX商用软件及剪切应力输运湍流模型对带槽双射流结构的流动与冷却特性进行数值研究

获得了横槽倾角对气膜冷却特性的影响规律。研究结果表明:在相同孔间距下

带槽结构能明显改善气膜在被冷却壁面的横向分布

增大气膜的横向覆盖面积

有效提高气膜冷却效率; 不同的横槽倾角对气膜冷却效率具有重要的影响

倾角均为30°时的方案冷却效果最好; 沿中心线远离气膜孔处出现未冷却区域

这可能与吹风比、横槽倾角、槽宽等参数有关。研究结果为射流冷却的流动与换热特性研究提供了参考依据。

Abstract

Double-jet film-cooling is able to significantly improve the film cooling effect

whereas has poor lateral cooling result. A new double-jet film cooling with trench is presented. The film holes are embedded in transverse trench perpendicular to the flow direction. To consider the influence of trench inclined angles on the film cooling characteristic

commercial software CFX and shear stress transport(SST)turbulence model are applied to numerically investigate the flow and film cooling characteristics of the double-jet film-cooling with trench at the averaged blowing ratio of 1.9. It is shown that the configuration with trench obviously improves the film transverse distribution on the cooled surfaces

and increases the film transverse cover area and enhances the film cooling effectiveness. The trench inclined angle greatly affects film cooling effectiveness

which reaches the best in the case of 30°. An uncooled zone far from the film holes along the centerline is found

which may be related to the blowing ratio

trench inclined angles and trench width.

关键词

Keywords

references

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