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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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    6. 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.
    7. 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.
    8. 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.
    9. Lin, Tong & Li, Xiaojun & Zhu, Zuchao & Xie, Jing & Li, Yi & Yang, Hui, 2021. "Application of enstrophy dissipation to analyze energy loss in a centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 163(C), pages 41-55.
    10. Fu, Xiaolong & Li, Deyou & Wang, Hongjie & Zhang, Guanghui & Li, Zhenggui & Wei, Xianzhu, 2020. "Numerical simulation of the transient flow in a pump-turbine during load rejection process with special emphasis on hydraulic acoustic effect," Renewable Energy, Elsevier, vol. 155(C), pages 1127-1138.
    11. 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).

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