双肩壁凹槽叶顶冷却传热性能的优化研究

秦正; 何坤; 晏鑫

doi:10.7652/xjtuxb202401006

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双肩壁凹槽叶顶冷却传热性能的优化研究

更新时间：2025-05-13

- 双肩壁凹槽叶顶冷却传热性能的优化研究
- A Study of Film Cooling and Heat Transfer Optimization for Double-Rim Squealer Tip
- 西安交通大学学报 2024年58卷第1期页码：68-80
- 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：
  
  : 2023-06-14。作者简介: 秦正(1997—),男,硕士生
  晏鑫(通信作者),男,教授。基金项目: 国家自然科学基金资助项目(52076165)。
- 基金信息：
  
  : 2023-06-14。作者简介: 秦正(1997—),男,硕士生;晏鑫(通信作者),男,教授。基金项目: 国家自然科学基金资助项目(52076165)。
- DOI：10.7652/xjtuxb202401006
  中图分类号： TK47
- 网络首发：2024-01-10，
  
  纸质出版：2024
- 稿件说明：
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秦正, 何坤, 晏鑫. 双肩壁凹槽叶顶冷却传热性能的优化研究[J]. 西安交通大学学报, 2024,58(1):68-80.

QIN Zheng, HE Kun, YAN Xin. A Study of Film Cooling and Heat Transfer Optimization for Double-Rim Squealer Tip[J]. 2024, 58(1): 68-80.
秦正, 何坤, 晏鑫. 双肩壁凹槽叶顶冷却传热性能的优化研究[J]. 西安交通大学学报, 2024,58(1):68-80. DOI： 10.7652/xjtuxb202401006.

QIN Zheng, HE Kun, YAN Xin. A Study of Film Cooling and Heat Transfer Optimization for Double-Rim Squealer Tip[J]. 2024, 58(1): 68-80. DOI： 10.7652/xjtuxb202401006.

摘要

为改善航空发动机透平第一级凹槽叶顶的冷却传热性能

利用自编程序搭建了凹槽叶顶的优化设计平台。采用三阶多项式响应面模型和Hooke-Jeeves模式搜索算法的组合优化策略

获得了一种具有优良气热性能的透平级双肩臂凹槽叶顶结构

并将优化结果与传统凹槽叶顶、4种典型双肩臂凹槽叶顶的传热和冷却性能进行了对比

分析了内肩臂的几何参数对凹槽叶顶流场结构和冷却传热性能的影响

评估了双肩臂凹槽叶顶冷却传热性能对设计变量的敏感性。结果表明:优化后的内肩臂分为上下两层; 合理的内肩臂几何参数可有效降低泄漏流的冲击作用

有利于冷却流在内外凹槽区域形成良好的覆盖; 与传统凹槽叶顶相比

优化后的双肩臂凹槽叶顶的平均传热系数下降了24.96%

平均气膜冷却效率上升了5.38%; 叶顶平均传热系数对内肩臂下层的高度最为敏感

叶顶平均气膜冷却效率对内肩臂上层的起始位置更加敏感

而内肩臂上层的高度对双肩臂凹槽叶顶的冷却传热性能影响相对较小。

Abstract

To improve the film cooling and heat transfer performance on the squealer tip of the first turbine stage in aero-engines

a design platform for optimization was constructed using a self-developed program

aiming at enhancing the film cooling effectiveness and minimizing heat transfer on the squealer tip. The Hooke-Jeeves searching algorithm combined with the third-order response surface model was utilized to find a proper double-rim squealer tip geometry with excellent aero-thermal performance. Additionally

a comparative analysis was conducted to assess the heat transfer and film cooling effects of the optimized double-rim squealer tip against those of the conventional squealer tip as well as four commonly used double-rim squealer tips. The study also investigated the influence of various geometrical parameters for inner-rim on the flow structures

heat transfer and film cooling effectiveness in the tip region

and involved evaluating the sensitivities of heat transfer and film cooling performance on the double-rim squealer tip to various design variables. The findings indicated that the optimized configuration of the inner rim in the double-rim squealer tip consisted of two layers

an upper and a lower layer. The selection of appropriate geometrical parameters for the inner rim resulted in a reduction of the impingement effect caused by the leakage flow

providing effective coolant coverage on the internal and external squealer cavities. In comparison to the conventional squealer tip

the optimized double-rim squealer tip showcased a 24.96% reduction in the area-averaged heat transfer coefficient and a 5.38% enhancement in the area-averaged film cooling effectiveness. The height of the lower layer in the inner rim had the most significant impact on the area-averaged heat transfer coefficient

while the starting location of the upper layer in the inner rim played a crucial role in the area-averaged film cooling effectiveness among the studied parameters. On the other hand

the height of the upper layer in the inner rim exhibited a relatively minor influence on the film cooling and heat transfer performance of the double-rim squealer tip.

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references

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