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Numerical Study on Cavitating Flow-Induced Pressure Fluctuations in a Gerotor Pump

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  • Peijian Zhou

    (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
    College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China
    Engineering Research Center of High-efficiency and Energy-saving Large Axial Flow Pumping Station, Yangzhou University, Yangzhou 225009, China)

  • Jiayi Cui

    (College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Gang Xiao

    (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
    College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China)

  • Chun Xiang

    (School of Mechanical and Automotive Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China)

  • Jiacheng Dai

    (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

  • Shuihua Zheng

    (College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China)

Abstract

Using the RNG k-ε turbulence model and a full cavitation model, this study numerically simulated cavitating flow-induced pressure fluctuations in a gerotor pump and analyzed the relationship between cavitating flow and pressure fluctuations. The results demonstrate that, as the inlet pressure decreases, the cavitation phenomenon in the gerotor pump intensifies, and the cavitation range in the rotor increases. Some of the vapor even spreads into the oil inlet groove, leading to high vapor content in the chamber that is in contact with the oil inlet groove. The pressure fluctuation characteristics of the flow field in the pump exhibit evident periodic changes. Under different cavitation conditions, the pressure fluctuation amplitude at the monitoring point decreases with increasing inlet pressure, whereas the main frequency of pressure fluctuation remains unaffected by cavitation conditions. The pressure fluctuation amplitude is the strongest at point O 1 of demarcation between the low-pressure and high-pressure zones in the chamber, and the volume between the oil inlet groove and the oil outlet groove serves as the main vibration source in the rotor pump. To ensure the stable and efficient operation of the gerotor pump, it is recommended to operate it at a larger NPSH.

Suggested Citation

  • Peijian Zhou & Jiayi Cui & Gang Xiao & Chun Xiang & Jiacheng Dai & Shuihua Zheng, 2023. "Numerical Study on Cavitating Flow-Induced Pressure Fluctuations in a Gerotor Pump," Energies, MDPI, vol. 16(21), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:21:p:7301-:d:1269058
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    References listed on IDEAS

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    1. Wenqiang Zhou & Peijian Zhou & Chun Xiang & Yang Wang & Jiegang Mou & Jiayi Cui, 2023. "A Review of Bionic Structures in Control of Aerodynamic Noise of Centrifugal Fans," Energies, MDPI, vol. 16(11), pages 1-24, May.
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