Optimization of Aero-Thermal Performance on a Squealer Blade Tip Considering the Combination of Oval Hole Inclination Angles

GUO Jiajie; LIANG Chongzhi; GUO Zhendong; SONG Liming; LI Jun

doi:10.7652/xjtuxb202310010

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Optimization of Aero-Thermal Performance on a Squealer Blade Tip Considering the Combination of Oval Hole Inclination Angles

更新时间：2025-05-08

- Optimization of Aero-Thermal Performance on a Squealer Blade Tip Considering the Combination of Oval Hole Inclination Angles
- Vol. 57, Issue 10, Pages: 99-110(2023)
- 作者机构：
  
  1. 西安交通大学能源与动力工程学院,西安,710049
  2. 东方汽轮机有限公司电站服务事业部,四川,德阳,618000
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202310010
  CLC： V232.4
- Online First：10 October 2023，
  
  Published：2023
- 稿件说明：
移动端阅览
GUO Jiajie, LIANG Chongzhi, GUO Zhendong, et al. Optimization of Aero-Thermal Performance on a Squealer Blade Tip Considering the Combination of Oval Hole Inclination Angles[J]. 2023, 57(10): 99-110.
DOI：

GUO Jiajie, LIANG Chongzhi, GUO Zhendong, et al. Optimization of Aero-Thermal Performance on a Squealer Blade Tip Considering the Combination of Oval Hole Inclination Angles[J]. 2023, 57(10): 99-110. DOI： 10.7652/xjtuxb202310010.

摘要

为进一步提高凹槽叶顶的冷却与气动性能

基于Kriging代理模型优化算法

耦合商业CFD分析软件

引入椭圆冷却孔型

设计了凹槽叶顶冷却孔组合偏转角参数化方法

并建立了组合偏转角自动优化框架。以实验条件下的GE-E

首级动叶的叶顶冷却孔布局为研究对象

兼顾冷却与气动两方面性能

开展了凹槽叶顶的冷却孔优化设计与气热分析。研究结果显示

在凹槽叶顶布置吸力面朝向与凹槽尾缘朝向的组合偏角气膜孔能有效增强气膜的贴壁性能

扩大气膜的覆盖范围

同时引导了射流向凹槽尾缘堆积

提升了刮削涡对泄漏流的阻塞作用

有效降低了泄漏流量。椭圆孔依靠低曲率的长轴边出流

相较于圆形孔进一步扩大了气膜覆盖范围并提升了贴壁性能

使凹槽尾缘的流线堆积效应相应增强

进一步地减少了泄漏流量。圆形孔优化结构相比参考结构的气膜冷却效率提高了331.7%

泄漏流量相对减少了1.641%; 椭圆孔优化结构的气膜冷却效率提升了565.1%

泄漏流量相对减少率为2.063%。

Abstract

For the purpose of enhancing cooling and aerodynamic performance of the squealer tip

based on the Kriging surrogate model and commercial CFD analysis software

a parameterization method combining inclination angles and cooling holes for the squealer tip was established and an automatic optimization framework was constructed. As the tip cooling hole layout on the GE-E

first stage rotor under the experimental conditions was taken as the research object

the optimization and thermal-aerodynamics analysis for the sque

aler tip were carried out

when both the cooling and the aerodynamic performance were taken into account. The results show that the combination of the negative radial inclination and the positive axial inclination can effectively improve the wall attachment performance and the coverage of the film. It also can divert the jet flow to accumulate at the cavity trailing edge

enhancing the blocking effect between the scraping vortex and the leakage flow and effectively reducing the leakage flow rate. Compared with the round hole

the oval hole can further improve the wall attachment performance and coverage of the film

relying on the outflow from the long axis edge which has a low curvature. so the streamline accumulation effect at the cavity trailing edge is enhanced

and the leakage flow is further reduced. For the round hole

its film cooling effectiveness of the optimization structure is 358.3% higher than that of the reference structure

and the relative reduction rate of leakage flow is 1.641%. For the optimization structure of the oval hole

the values are 565.1% and 2.063%

respectively.

关键词

Keywords

references

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