Numerical Simulation on Unsteady Flow Mechanism of a 1.5-Stage Axial Transonic Compressor

  • PENG Shuxuan ,
  • ZHANG Xiaoyu ,
  • WANG Wentao ,
  • ZHANG Hongwu ,
  • LI Xinlong
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  • 1. High Efficiency and Low Carbon Gas Turbine Digitalization Research Centre, Nanjing Institute of Future Energy System, Nanjing 211135, China
    2. Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
    3. Key Laboratory of Advanced Energy and Power, Chinese Academy of Sciences, Beijing 100190, China
    4. Innovation Academy for Light-Duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China
    5. University of Chinese Academy of Sciences, Beijing 100049, China
    6. BYD Auto Industry Company Limited, Shenzhen 518116, China

Online published: 2024-09-09

Supported by

The authors gratefully acknowledge for the support of the grants of Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA29050500).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2024

Abstract

In this paper, a numerical simulation method is used to calculate a 1.5-stage axial transonic compressor to explore its unsteady flow mechanism. The performance curve is compared with the experimental data to verify the calculation method with a high numerical accuracy, which shows that the unsteady calculation has good reliability. According to the analysis of the data from the monitoring points under the near-stall condition, the unsteady disturbances originate from the tip region of blade and perform the strongest at the blade pressure surface with a broadband characteristic. Further analysis is conducted by combining with the characteristics of the transient flow field at the tip of blade. The results show that the unsteady pressure fluctuations are caused by the migration of the new vortex cores. These new vortex cores are generated by the breakdown of leakage vortex in the downstream, which is induced by the leakage vortex and shock wave interference. Moreover, the relationship between the unsteady flow characteristics and the working conditions is also studied. The leakage vortex intensity and the shock wave strength gradually increase with the decrease of flow rate. When the combination of the leakage vortex intensity and shock wave strength reaches the first threshold, a single frequency of unsteady disturbances appears at the blade tip. When the combination of the leakage vortex intensity and shock wave strength reaches the second threshold, the frequency of unsteady disturbances changes to a broadband.

Cite this article

PENG Shuxuan , ZHANG Xiaoyu , WANG Wentao , ZHANG Hongwu , LI Xinlong . Numerical Simulation on Unsteady Flow Mechanism of a 1.5-Stage Axial Transonic Compressor[J]. Journal of Thermal Science, 2024 , 33(5) : 1851 -1866 . DOI: 10.1007/s11630-024-2018-9

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