Investigation on the Film Cooling Efficiency on a Plain Surface with Hole Embedded in Contoured Crater

doi:10.7652/xjtuxb202007011

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Investigation on the Film Cooling Efficiency on a Plain Surface with Hole Embedded in Contoured Crater

更新时间：2025-07-09

- Investigation on the Film Cooling Efficiency on a Plain Surface with Hole Embedded in Contoured Crater
- Vol. 54, Issue 7, Pages: 84-93(2020)
- 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/xjtuxb202007011
  CLC： TK474.7
- Online First：10 July 2020，
  
  Published：2020
- 稿件说明：
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Investigation on the Film Cooling Efficiency on a Plain Surface with Hole Embedded in Contoured Crater[J]. 2020, 54(7): 84-93.
DOI：

Investigation on the Film Cooling Efficiency on a Plain Surface with Hole Embedded in Contoured Crater[J]. 2020, 54(7): 84-93. DOI： 10.7652/xjtuxb202007011.

摘要

设计了一种造型凹坑冷却孔结构

采用数值求解雷诺平均Navier-Stokes方程的方法

研究了造型凹坑孔结构对平板气膜冷却性能的影响

并利用已有的实验数据考核了数值方法的有效性。通过计算得到了6种吹风比、3种凹坑深度条件下带造型凹坑孔的平板气膜冷却性能

并与常规圆孔进行了对比。研究结果表明:在考核的7种湍流模型中

Realizable k-ε湍流模型可以较好地模拟平板壁面的冷却性能; 造型凹坑孔可以产生一对阻碍肾形涡发展的反向旋涡

降低冷却流体与高温主流的掺混作用

增加冷却流体在周向上的覆盖

从而提高气膜冷却效率; 相比于常规圆孔结构

造型凹坑孔可以有效地提高轴向中心线及周向平均气膜冷却效率

在不同吹风比条件下

造型凹坑孔的气膜冷却效率在轴向长度为3倍孔径的区域提高了20%～200%

在3倍到10倍孔径的区域提高了10%～25%; 在所研究的3种凹坑深度中

凹坑深度为圆孔直径的0.7倍时平板气膜冷却性能最优。

Abstract

A contoured crater cooling hole was designed. With solutions of RANS(Reynolds-averaged Navier-Stokes)equations

the film cooling efficiency on a plain surface with cooling hole embedded in contoured crater was investigated. With the existing experimental data

the reliability of numerical methods was validated. Then

the influences of blowing ratio and crater depth on the cooling efficiency were studied. The numerical results for plain surface with cooling hole embedded in contoured crater were also compared with that of the conventional round hole configuration. The results show that

among all selected turbulence models

the Reali-able k-- turbulence model has the superior accuracy in predicting the cooling efficiency on plain surface. The cooling hole embedded in contoured crater is able to generate a pair of reverse vortices that hinder the development of kidney vortices

reducing the mixing effect of coolant and high temperature mainstream. Correspondingly

the coverage of coolin

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