Effect of Combustion Chamber Outlet Swirling Flow on Flow Pattern,Heat Transfer and Cooling Characteristics of Turbine Vane Endwall

LI Zhiyu; ZHANG Kaiyuan; LI Zhigang; LI Jun

doi:10.7652/xjtuxb202204008

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Effect of Combustion Chamber Outlet Swirling Flow on Flow Pattern,Heat Transfer and Cooling Characteristics of Turbine Vane Endwall

更新时间：2025-07-09

- Effect of Combustion Chamber Outlet Swirling Flow on Flow Pattern,Heat Transfer and Cooling Characteristics of Turbine Vane Endwall
- Vol. 56, Issue 4, Pages: 72-82(2022)
- 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/xjtuxb202204008
  CLC： TK474.4
- Online First：10 April 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
LI Zhiyu, ZHANG Kaiyuan, LI Zhigang, et al. Effect of Combustion Chamber Outlet Swirling Flow on Flow Pattern,Heat Transfer and Cooling Characteristics of Turbine Vane Endwall[J]. 2022, 56(4): 72-82.
DOI：

LI Zhiyu, ZHANG Kaiyuan, LI Zhigang, et al. Effect of Combustion Chamber Outlet Swirling Flow on Flow Pattern,Heat Transfer and Cooling Characteristics of Turbine Vane Endwall[J]. 2022, 56(4): 72-82. DOI： 10.7652/xjtuxb202204008.

摘要

贫油预混燃烧室出口的强旋流和温度不均匀特征向下游迁移

直接影响了下游涡轮静叶栅端壁的气动性能

进而改变了气膜冷却端壁的传热冷却特性。设计了具有典型速度和温度出口特征的燃烧室

与实验数据对比

验证了设计的燃烧室出口具有典型的旋流和温度分布特征。采用数值求解三维雷诺平均N-S方程和剪切应力传输湍流模型SST k-ω研究了燃烧室出口旋流对静叶栅端壁流动型态和传热冷却特性的影响。对比分析了燃烧室出口旋流核心与静叶栅沿栅距5个相对位置时气膜冷却端壁的流场型态和传热冷却特性。研究表明:当燃烧室出口旋流中心正对静叶片1时

马蹄涡压力面分支横向迁移被削弱造成滞止点向下游移动

端壁传热恶化

第3排气膜冷却射流被带离端壁

绝热气膜有效度降低; 旋流中心正对静叶片2时

马蹄涡压力面分支裹挟第2排气膜冷却射流冲击吸力面

二次冷却效果提升的同时端壁面平均气膜有效度提高

最大值为0.148

无量纲面平均热通量减小了0.055 5。该研究揭示了燃烧室出口旋流对下游静叶栅端壁流场型态和传热冷却特性的影响机制

为端壁气膜冷却布局设计提供了一定的参考。

Abstract

The strong swirling flow and nonuniform temperature at the outlet of lean oil premixed combustion chamber transfer downstream

which directly affects the aerodynamic performance of the vane endwall of downstream turbine

and then changes the endwall heat transfer and film cooling characteristics. The combustion chamber is designed with typical outlet velocity and temperature characteristics. Comparing with the experimental data

we have verified that the swirling flow and temperature distribution of designed combustion chamber outlet is typical. In this paper

we studied the influence of combustion chamber outlet swirling flow on the flow pattern

heat transfer and film cooling characteristics of the turbine vane endwall by numerical solution of 3D Reynolds-averaged Navier-Stokes(RANS)equation and shear stress transport turbulence model(SST k-ω). The flow field pattern

heat transfer and film cooling characteristics of the turbine vane endwall at 5 relative positions along the pitch between the center of combustion chamber outlet swirling flow and the turbine vane are compared and analyzed. The result shows that when the center of combustion chamber outlet swirling flow is facing the vane 1

the lateral movement of the pressure side leg of the horseshoe vortex is weakened

and the heat transfer at endwall exacerbates due to downstream movement of stagnation point; the coolant at the third row of film hole is taken away from the endwall

so the heat insulation effectiveness of air film decreases. When the swirling flow center is facing the vane 2

the pressure side leg of the horseshoe vortex envelopes the coolant at the second row of film hole and impacts suction surface

which improves the secondary cooling effect while the average film cooling effectiveness at the endwall surface increases(the maximum value is 0.148

and thesurface averaged net heat flux reduction is 0.055 5). This study reveals the influence mechanism of the combustion chamber outlet swirling flow on the flow field pattern

heat transfer and film cooling characteristics at the endwall of the downstream turbine vane

which provides some reference for the layout design of endwall film cooling.

关键词

Keywords

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