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Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode

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  • Yang, Jun
  • Pavesi, Giorgio
  • Liu, Xiaohua
  • Xie, Tian
  • Liu, Jun

Abstract

This article reports the fluid-dynamical analyses of unsteady flow in the first stage of a multistage pump-turbine where hump instability occurs. This stage can be seen as a centrifugal pump with multistage guide vanes in pump mode. Experimental and numerical approaches are adopted to contribute the understanding of the highly complex flow regime inner the test pump. In the experimental test, both dynamic pressure measurement and flow visualization techniques are adopted. A commercial code with detached eddy simulation (DES) model is used to compute the flow regime. The frequency analysis indicates that two unsteady flow patterns with a constant frequency occur in the hump instability region. The numerical and experimental unsteady flow fields are analysed to study the fluid-dynamical features of these unsteady patterns, in order to investigate the origin and reveal their contributions to the hump instability.

Suggested Citation

  • Yang, Jun & Pavesi, Giorgio & Liu, Xiaohua & Xie, Tian & Liu, Jun, 2018. "Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 127(C), pages 377-385.
    • Handle: RePEc:eee:renene:v:127:y:2018:i:c:p:377-385
    DOI: 10.1016/j.renene.2018.04.069
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    References listed on IDEAS

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    2. 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.
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    5. Deyou Li & Yuekun Sun & Zhigang Zuo & Shuhong Liu & Hongjie Wang & Zhenggui Li, 2018. "Analysis of Pressure Fluctuations in a Prototype Pump-Turbine with Different Numbers of Runner Blades in Turbine Mode," Energies, MDPI, vol. 11(6), pages 1-17, June.
    6. Wang, Wenjie & Tai, Geyuan & Pei, Ji & Pavesi, Giorgio & Yuan, Shouqi, 2022. "Numerical investigation of the effect of the closure law of wicket gates on the transient characteristics of pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 194(C), pages 719-733.
    7. Zhao, Yuanqi & Li, Deyou & Chang, Hong & Fu, Xiaolong & Wang, Hongjie & Qin, Daqing, 2023. "Suppression effect of bionic guide vanes with different parameters on the hump characteristics of pump-turbines based on entropy production theory," Energy, Elsevier, vol. 283(C).
    8. Li, Deyou & Zuo, Zhigang & Wang, Hongjie & Liu, Shuhong & Wei, Xianzhu & Qin, Daqing, 2019. "Review of positive slopes on pump performance characteristics of pump-turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 901-916.
    9. Ran, Hongjuan & Liu, Yong & Luo, Xianwu & Shi, Tianjiao & Xu, Yongliang & Chen, Yuanlin & Wang, Dezhong, 2020. "Experimental comparison of two different positive slopes in one single pump turbine," Renewable Energy, Elsevier, vol. 154(C), pages 1218-1228.
    10. Li, Deyou & Fu, Xiaolong & Zuo, Zhigang & Wang, Hongjie & Li, Zhenggui & Liu, Shuhong & Wei, Xianzhu, 2019. "Investigation methods for analysis of transient phenomena concerning design and operation of hydraulic-machine systems—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 101(C), pages 26-46.
    11. Li, Xiaojun & Chen, Bo & Luo, Xianwu & Zhu, Zuchao, 2020. "Effects of flow pattern on hydraulic performance and energy conversion characterisation in a centrifugal pump," Renewable Energy, Elsevier, vol. 151(C), pages 475-487.

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