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Journal of Thermal Science

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2025 , Vol. 34 >Issue 3: 834 - 849

DOI: https://doi.org/10.1007/s11630-025-2024-6

Experimental and Numerical Study on the Trailing Edge Cutback Cooling Characteristics with POD Analysis

  • LIU Jiajie ,
  • WANG Pengfei ,
  • WANG Pei ,
  • LIU Jun ,
  • DU Qiang ,
  • WANG Haohan ,
  • WANG Zhiguo ,
  • SHEN Xin ,
  • ZHU Junqiang
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  • 1. Key Lab of Light-duty Gas-turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine, Beijing 100190, China
    4. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China

网络出版日期: 2025-05-06

基金资助

The authors thank to the financial support of National Natural Science Foundation of China (Grant No. 52306055), National Science and Technology Major Project (J2019-II-0022-0043) and Youth Innovation Promotion Association of the Chinese Academy of Sciences. The ANSYS software and computation resources supplied by Beijing Super Cloud Computing Center are also acknowledged.

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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Experimental and Numerical Study on the Trailing Edge Cutback Cooling Characteristics with POD Analysis

  • LIU Jiajie ,
  • WANG Pengfei ,
  • WANG Pei ,
  • LIU Jun ,
  • DU Qiang ,
  • WANG Haohan ,
  • WANG Zhiguo ,
  • SHEN Xin ,
  • ZHU Junqiang
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  • 1. Key Lab of Light-duty Gas-turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine, Beijing 100190, China
    4. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China

Online published: 2025-05-06

Supported by

The authors thank to the financial support of National Natural Science Foundation of China (Grant No. 52306055), National Science and Technology Major Project (J2019-II-0022-0043) and Youth Innovation Promotion Association of the Chinese Academy of Sciences. The ANSYS software and computation resources supplied by Beijing Super Cloud Computing Center are also acknowledged.

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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摘要

本文研究了航空发动机涡轮叶片尾缘劈缝的气膜冷却特性以及其流场涡结构，探讨了该冷却结构的非定常流动掺混机理。本文对尾缘劈缝部件开展了快响PSP、高频PIV实验，并使用DDES湍流模型进行了数值模拟。实验与仿真结果得到了较为吻合的气膜冷却时均特性以及流场涡系结构。通过本征正交分解（Proper orthogonal decomposition）方法分析了仿真流场数据，提取出流场的本征正交模态。随着吹风比的增加，劈缝的气膜冷却有效性η呈现“增-减-增”的趋势，在吹风比Mslot为0.75左右时η处于最低点。不同的吹风比下掺混过程出现了不同的非定常脱落涡结构，小吹风比Mslot为0.3时，主流侧涡主导了流场的掺混流动。吹风比Mslot为0.75时，两侧涡相互掺混出现了类卡门涡街形式的脱落涡。吹风比继续增大后，流场的涡结构转为由冷气侧涡主导。由POD方法分析得知，不同吹风比下近壁区域均出现类卡门涡街的1、2阶模态，在Mslot为0.75时该模态所占能量比最高，流场中形成稳定的主导相干结构。伴随吹风比增大，温度场中的主要特征模态逐渐变化，气膜冷却有效性最低时模态呈月牙形。文章结合流场的涡系结构解释了η最低点时的流场特征分布，分析了其对壁面气膜冷却特性的影响。

关键词： trailing edge cutback; film cooling; unsteady flow mixing; shedding vortices; Proper Orthogonal Decomposition (POD)

本文引用格式

LIU Jiajie , WANG Pengfei , WANG Pei , LIU Jun , DU Qiang , WANG Haohan , WANG Zhiguo , SHEN Xin , ZHU Junqiang . Experimental and Numerical Study on the Trailing Edge Cutback Cooling Characteristics with POD Analysis[J]. 热科学学报, 2025 , 34(3) : 834 -849 . DOI: 10.1007/s11630-025-2024-6

Abstract

This paper investigates the film cooling characteristics and flow structure of trailing edge cutback in turbine vanes, and explains the unsteady flow mixing mechanism of this cooling structure using Proper Orthogonal Decomposition (POD) method. The Delayed Detached Eddy Simulation (DDES) turbulence model was used to obtain detailed information about the velocity and temperature field for the POD method. To verify the accuracy of the numerical results, fast-response Pressure Sensitive Paint (PSP) and high-frequency Particle Image Velocimetry (PIV) experiments were also conducted, and the results achieved good agreement. As the blowing ratio increases, the effectiveness η of the cutback’s film cooling exhibits a “increase-decrease-increase” trend, with η reaching its minimum point at around a blowing ratio (Mslot) of 0.75. Three kinds of coherent vortex structures are observed in the flow field at different blowing ratios. According to the analysis using the POD method, the first and second order modes of a Karman-like vortex street are observed in the vicinity of the wall at various blowing ratios. This coherent flow structure is directly related to the mixing intensity between the mainstream gas and the coolant. At Mslot=0.75, these modes had the highest energy ratio and formed a stable dominant coherent structure in the flow field. As the blowing ratio increases, the main characteristic modes in the temperature field gradually change, and the mode appears crescent-shaped when the effectiveness of film cooling is at its lowest. This paper combines the vortex structure of the flow field to explain the flow field feature distribution at the lowest effectiveness point η and analyzes its impact on the film cooling characteristics of the protected surface.

Key words： trailing edge cutback; film cooling; unsteady flow mixing; shedding vortices; Proper Orthogonal Decomposition (POD)

参考文献

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