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2024 , Vol. 33 >Issue 1: 138 - 157

DOI: https://doi.org/10.1007/s11630-023-1823-x

Effect of Incoming Vortex on Secondary Flows in Turbine Cascades with Planar and Non-Axisymmetric Endwall

  • CAO Zhiyuan ,
  • WANG Chuxuan ,
  • SONG Zhigao ,
  • GAO Xi ,
  • ZHAO Wei ,
  • LIU Bo
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  • 1. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China 
    2. National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwestern Polytechnical University, Xi’an 710072, China 
    3. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China 
    4. School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100080, China

网络出版日期: 2024-01-16

基金资助

This work was supported by National Science and Technology Major Project (J2019-II-0011-0031), the foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research (No. D5150230005), the Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University (No. PF2023091) and National Natural Science Foundation of China (No. 51806174). 

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Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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Effect of Incoming Vortex on Secondary Flows in Turbine Cascades with Planar and Non-Axisymmetric Endwall

  • CAO Zhiyuan ,
  • WANG Chuxuan ,
  • SONG Zhigao ,
  • GAO Xi ,
  • ZHAO Wei ,
  • LIU Bo
Expand
  • 1. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China 
    2. National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwestern Polytechnical University, Xi’an 710072, China 
    3. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China 
    4. School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100080, China

Online published: 2024-01-16

Supported by

This work was supported by National Science and Technology Major Project (J2019-II-0011-0031), the foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research (No. D5150230005), the Practice and Innovation Funds for Graduate Students of Northwestern Polytechnical University (No. PF2023091) and National Natural Science Foundation of China (No. 51806174). 

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023
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摘要

非轴对称端壁造型通常被用来控制涡轮的二次流。多数端壁造型研究针对单级叶排工况开展，级环境下的研究较为缺乏。因此，本文探究了端壁造型对某高负荷涡轮叶栅端壁二次流损失的控制机理；研究将三角翼旋流发生器安置于涡轮叶栅上游，用来模拟级环境下来流涡干涉工况。在无来流涡干涉的条件下，采用自主的优化平台对该高负荷涡轮叶栅开展非轴对称端壁优化，并在来流涡干涉条件下开展数值模拟研究。结果表明：端壁造型能够有效改善涡轮叶栅端壁二次流流场，使得其总压损失系数和二次动能系数分别下降7.3%和45.7%。在来流涡干涉条件下，端壁造型依旧能够对涡轮叶栅端壁二次流产生良好的控制效果，具有非轴对称端壁的涡轮叶栅的总压损失系数二次动能系数相较于轴对称端壁涡轮叶栅分别平均降低了7.8%和14.2%。在特定位置来流涡干涉下，轴对称叶栅端壁横向二次流迁移受来流涡影响，叶栅总压损失降低。4/7周向位置来流涡到达叶片前缘，导致大量低能流体的产生，涡轮叶栅马蹄涡大小和强度均被增加。来流涡处于所有周向位置条件下，非轴对称端壁造型均能有效显著抑制二次流涡系，例如通道涡和反涡。

关键词： non-axisymmetric endwall; secondary flow; incoming vortex; passage vortex; stage environment

本文引用格式

CAO Zhiyuan , WANG Chuxuan , SONG Zhigao , GAO Xi , ZHAO Wei , LIU Bo . Effect of Incoming Vortex on Secondary Flows in Turbine Cascades with Planar and Non-Axisymmetric Endwall[J]. 热科学学报, 2024 , 33(1) : 138 -157 . DOI: 10.1007/s11630-023-1823-x

Abstract

Non-Axisymmetric Endwall Profiling (NAEP) is commonly utilized in turbines to eliminate secondary flows. Nevertheless, most of the NAEP methods consider a single-blade row environment without incorporating the effect of the stage environment. This paper aims to investigate the influence mechanism of the incoming vortex on the endwall secondary flow structures of NAEP in a highly loaded turbine cascade. To model the incoming vortex in a stage environment, this study considers a half-delta wing as the vortex generator at the upstream of the turbine cascade. The NAEP is then carried out for a highly loaded turbine cascade with an in-house numerical optimization design platform subject to no incoming vortex. Numerical simulation is also carried out under the influence of the incoming vortex for the turbine cascades with both planar and non-axisymmetric endwall. This paper furthers investigated the pitchwise effect of the incoming vortex on the near endwall secondary flow. The results indicate that the NAEP effectively improves the endwall secondary flow of the turbine cascade, where the total pressure loss coefficient and the secondary kinetic energy (SKE) are reduced by 7.3%, and 45.7%, respectively. It is further seen that with the incoming vortex, the NAEP achieves a considerable control effect on the endwall secondary flow of the turbine cascade. With incoming vortex, the NAEP can still achieve considerable control effect on the endwall secondary flow of the turbine cascade; the averaged reductions of loss coefficient and SKE are 7.8% and 14.2%, respectively. Under some pitchwise locations, incoming vortex can suppress the convection of cross-passage flow toward the suction corner greatly and reduce the loss coefficient of the baseline cascade. The incoming vortex at 4/7 pitch impinged right at the blade leading edge, leading to the generation of low-momentum fluid, which increased the size and the strength of the horseshoe vortex. Under all the pitchwise locations, NAEP can suppress the secondary vortices, e.g., the passage vortex and the counter vortex, considerably.

Key words： non-axisymmetric endwall; secondary flow; incoming vortex; passage vortex; stage environment

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