气膜孔几何位置对旋流冷却流动与传热特性的影响

范小军; 杜长河; 李亮; 李森

doi:10.7652/xjtuxb201607006

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气膜孔几何位置对旋流冷却流动与传热特性的影响

更新时间：2025-07-09

- 气膜孔几何位置对旋流冷却流动与传热特性的影响
- Effect of Bleed Hole Location on Vortex Cooling Flow and Heat Transfer Performance
- 西安交通大学学报 2016年50卷第7期页码：32-38
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201607006
  中图分类号： TK474.7
- 网络首发：2016-07-10，
  
  纸质出版：2016
- 稿件说明：
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范小军, 杜长河, 李亮, 等. 气膜孔几何位置对旋流冷却流动与传热特性的影响[J]. 西安交通大学学报, 2016,50(7):32-38.

Effect of Bleed Hole Location on Vortex Cooling Flow and Heat Transfer Performance[J]. 2016, 50(7): 32-38.
范小军, 杜长河, 李亮, 等. 气膜孔几何位置对旋流冷却流动与传热特性的影响[J]. 西安交通大学学报, 2016,50(7):32-38. DOI： 10.7652/xjtuxb201607006.

Effect of Bleed Hole Location on Vortex Cooling Flow and Heat Transfer Performance[J]. 2016, 50(7): 32-38. DOI： 10.7652/xjtuxb201607006.

摘要

为了研究气膜孔几何位置对旋流冷却特性的影响

建立了带有气膜孔的旋流腔冷却结构

利用流体动力学软件ANSYS CFX对比分析了有无气膜孔情况下旋流冷却性能的差异

并研究了气膜孔轴宽比和周向角度对旋流冷却流动和换热特性的影响。研究结果表明:气膜孔对旋流腔靶面旋流冷气运动产生强烈扰动

使气膜孔上游冷气流速增加

下游冷气流速降低; 气膜孔使主流流线向斜下方偏转

增强了整体换热强度且整体压力分布趋于均匀; 轴宽比从0.3增加到0.7

气膜孔对整体流动和传热影响不大

轴宽比增加到0.9

主流小旋涡消失且靶面Nu分布更均匀; 周向角度小于0°时

随着周向角度的增加

气膜孔上游高速区增大

周向角度超过0°后

高速区随周向角度增长不明显; 随着周向角度增加

周向平均压力系数增加

气膜孔附近高Nu区扩大

靶面高Nu区分布更均匀。

Abstract

A vortex chamber model with bleed holes was established to study the effect of bleed hole location on vortex cooling characteristics. The hydrodynamics software ANSYS CFX was used to investigate the difference between vortex cooling systems with and without bleed holes. Detailed analysis was conducted to explore the influences of bleed hole's axis-width ratio and circumferential angle on vortex cooling aerodynamic and thermal behaviors. Results revealed that bleed holes could produce strong disturbance on the cooling air rotational flow

thus increasing the upstream velocity of bleed holes while decreasing the downstream velocity. Bleed holes drive the mainstream deflecting towards the slanting downward direction

enhancing the overall heat transfer intensity and inducing more uniform pressure distribution. When the axis-width ratio increases from 0.3 to 0.7

bleed holes have slight effects on the overall flow and heat transfer performance. However

when the axis-width ratio reaches 0.9

the small mainstream vortexes disappear and the region with high Nu(Nusselt number)becomes more uniform. When the circumferential angle is smaller than 0°

an increase in circumferential angle leads to an obvious increase in high speed region of upstream bleed holes. However

this increasing tendency turns weaker when the circumferential angle is larger than 0°. As circumferential angle increases

the circumferential average pressure ratio and high-Nu region near the bleed holes both increase

and the distribution of high-Nu region becomes more uniform.

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references

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