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Influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine

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  • Zhu, Di
  • Xiao, Ruofu
  • Liu, Weichao

Abstract

The variation of blade axial force of pump-turbine, which may cause instability on impeller shaft system, can be influenced by cavitation. However, the mechanism of this phenomenon is still not clarified. In this study, numerical simulation and experimental research are combined to investigate the influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine. From no cavitation to critical cavitation, the axial force increases first and then decreases rapidly. The largest increase is 5% and the largest decrease is 13%. Under different flow conditions, the cavitation pattern of blade leading-edge changes differently. With the increase of flow rate, flow separation and pressure drop gradually move from suction side to pressure side. The change of blade axial force caused by the change of blade loading is essentially related to the cavitation occurring on the pressure surface or suction surface. The variation of axial force with cavitation development is similar but the mechanism is different under different conditions. This study reveals the effect of cavitation on blade axial force and its mechanism. The research results can provide reference for improving the operation stability of pump turbine unit.

Suggested Citation

  • Zhu, Di & Xiao, Ruofu & Liu, Weichao, 2021. "Influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine," Renewable Energy, Elsevier, vol. 163(C), pages 939-949.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:939-949
    DOI: 10.1016/j.renene.2020.09.002
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    References listed on IDEAS

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    1. Tao, Ran & Xiao, Ruofu & Wang, Fujun & Liu, Weichao, 2018. "Cavitation behavior study in the pump mode of a reversible pump-turbine," Renewable Energy, Elsevier, vol. 125(C), pages 655-667.
    2. Tao, Ran & Xiao, Ruofu & Wang, Fujun & Liu, Weichao, 2019. "Improving the cavitation inception performance of a reversible pump-turbine in pump mode by blade profile redesign: Design concept, method and applications," Renewable Energy, Elsevier, vol. 133(C), pages 325-342.
    3. Hao, Yue & Tan, Lei, 2018. "Symmetrical and unsymmetrical tip clearances on cavitation performance and radial force of a mixed flow pump as turbine at pump mode," Renewable Energy, Elsevier, vol. 127(C), pages 368-376.
    4. Lu, Guocheng & Zuo, Zhigang & Sun, Yuekun & Liu, Demin & Tsujimoto, Yoshinobu & Liu, Shuhong, 2017. "Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine," Renewable Energy, Elsevier, vol. 113(C), pages 1539-1550.
    5. Zhang, Yuning & Zheng, Xianghao & Li, Jinwei & Du, Xiaoze, 2019. "Experimental study on the vibrational performance and its physical origins of a prototype reversible pump turbine in the pumped hydro energy storage power station," Renewable Energy, Elsevier, vol. 130(C), pages 667-676.
    6. Chuan Wang & Weidong Shi & Li Zhang, 2013. "Calculation Formula Optimization and Effect of Ring Clearance on Axial Force of Multistage Pump," Mathematical Problems in Engineering, Hindawi, vol. 2013, pages 1-7, October.
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    Cited by:

    1. Buchao Xu & Weiqiang Zhao & Wenhua Lin & Zhongyu Mao & Ran Tao & Zhengwei Wang, 2022. "The Influence of Different Operating Conditions on the Support Bracket Stress in Pumped Storage Units," Energies, MDPI, vol. 15(6), pages 1-15, March.
    2. Fan, Yading & Chen, Tairan & Liang, Wendong & Wang, Guoyu & Huang, Biao, 2022. "Numerical and theoretical investigations of the cavitation performance and instability for the cryogenic inducer," Renewable Energy, Elsevier, vol. 184(C), pages 291-305.
    3. Yuan, Zhiyi & Zhang, Yongxue & Zhang, Jinya & Zhu, Jianjun, 2021. "Experimental studies of unsteady cavitation at the tongue of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 177(C), pages 1265-1281.

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