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A Numerical Study on Leakage Flow in the Shroud Cavity of a Centrifugal Impeller

Author

Listed:
  • Jiaxi Chen

    (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100191, China
    School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Zhitao Zuo

    (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100191, China
    School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    National Energy Large Scale Physical Energy Storage Technologies R&D Center (Bijie), Bijie 551712, China)

  • Jixiang Chen

    (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100191, China
    School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Jianting Sun

    (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100191, China)

  • Haisheng Chen

    (Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100191, China
    School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China
    National Energy Large Scale Physical Energy Storage Technologies R&D Center (Bijie), Bijie 551712, China)

Abstract

A high-pressure centrifugal compressor with a shroud cavity is a key piece of energy equipment found in a compressed air energy storage (CAES) system. The leakage flow of the shroud cavity is an important factor affecting the efficiency of the system. Using systematic numerical studies, the influence of leakage flow on high-pressure centrifugal compressors under different leakage rates has been comprehensively elucidated. The study reveals that the leakage flow significantly increases the circumferential swirl angle of the flow at the impeller inlet, thereby exerting a significant influence on the flow characteristics within the impeller. As the leakage rate increases, the stable operating range of the compressor is significantly reduced, with the total pressure ratio decreasing by up to 2% and the isentropic efficiency dropping by up to 4 percentage points.

Suggested Citation

  • Jiaxi Chen & Zhitao Zuo & Jixiang Chen & Jianting Sun & Haisheng Chen, 2025. "A Numerical Study on Leakage Flow in the Shroud Cavity of a Centrifugal Impeller," Energies, MDPI, vol. 18(8), pages 1-19, April.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:8:p:2042-:d:1635926
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    References listed on IDEAS

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    1. Ekoue, Maurice K. & Woerman, Matt & Clastres, Cédric, 2025. "Intermittency and uncertainty in wind and solar energy: Impacts on the French electricity market," Energy Economics, Elsevier, vol. 142(C).
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