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Numerical investigation of the flow regime and cavitation in the vanes of reversible pump-turbine during pump mode's starting up

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  • Tao, Ran
  • Zhou, Xuezhi
  • Xu, Buchao
  • Wang, Zhengwei

Abstract

In reversible pump-turbines, cavitation mainly occurs on runner blade especially in pump mode. However, cavitation erosion can be found in the guide and stay vanes. When pump-turbine started up in pump mode, the guide vane kept small opening angle with runner pumping for a relatively long-time. In this study, the submerged jet flow inter-guide-vane was studied during pump mode's starting up to evaluate the easily-ignored vane cavitation. Twenty-six combinations of guide vane opening angle (<7°) and flow rate (<40% maximum flow rate) were numerically tested in total. Submerged jet flow existed inter-guide-vane induced sudden pressure drop especially when flow rate proportion (against the maximum flowrate) was bigger than the guide vane opening angle proportion (against the maximum opening angle). Pressure can drop to the minimum in the entire domain and induce cavitation under actual conditions. Cavitation mainly generated on the guide vane leading-edge and trailing-edge and probably occurred on the stay vane leading-edge and in the vaneless region. The jet-vortex cavitation in vanes was found possible by interpolating the guide vane opening law. This paper would help researchers to focus and prevent the inter-vane cavitation and summarize a more reasonable law for pump mode's starting up.

Suggested Citation

  • Tao, Ran & Zhou, Xuezhi & Xu, Buchao & Wang, Zhengwei, 2019. "Numerical investigation of the flow regime and cavitation in the vanes of reversible pump-turbine during pump mode's starting up," Renewable Energy, Elsevier, vol. 141(C), pages 9-19.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:9-19
    DOI: 10.1016/j.renene.2019.03.108
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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. Deane, J.P. & Ó Gallachóir, B.P. & McKeogh, E.J., 2010. "Techno-economic review of existing and new pumped hydro energy storage plant," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(4), pages 1293-1302, May.
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    Cited by:

    1. Štefan, David & Rossi, Mosè & Hudec, Martin & Rudolf, Pavel & Nigro, Alessandra & Renzi, Massimiliano, 2020. "Study of the internal flow field in a pump-as-turbine (PaT): Numerical investigation, overall performance prediction model and velocity vector analysis," Renewable Energy, Elsevier, vol. 156(C), pages 158-172.
    2. Daniels, S.J. & Rahat, A.A.M. & Tabor, G.R. & Fieldsend, J.E. & Everson, R.M., 2020. "Shape optimisation of the sharp-heeled Kaplan draft tube: Performance evaluation using Computational Fluid Dynamics," Renewable Energy, Elsevier, vol. 160(C), pages 112-126.
    3. Zhang, Hao & Guo, Pengcheng & Sun, Longgang, 2020. "Transient analysis of a multi-unit pumped storage system during load rejection process," Renewable Energy, Elsevier, vol. 152(C), pages 34-43.
    4. 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.
    5. Lu, Zhaoheng & Tao, Ran & Yao, Zhifeng & Liu, Weichao & Xiao, Ruofu, 2022. "Effects of guide vane shape on the performances of pump-turbine: A comparative study in energy storage and power generation," Renewable Energy, Elsevier, vol. 197(C), pages 268-287.
    6. Wang, Cong & Zhang, Yongxue & Yuan, Zhiyi & Ji, Kaizhuo, 2020. "Development and application of the entropy production diagnostic model to the cavitation flow of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 154(C), pages 774-785.

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