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Transient Hydrodynamic Behavior of a Pump as Turbine with Varying Rotating Speed

Author

Listed:
  • Jianxin Hu

    (National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Wenfeng Su

    (National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Ke Li

    (National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Kexin Wu

    (National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Ling Xue

    (National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Guolei He

    (Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China)

Abstract

The working condition of a centrifugal pump as a turbine (PAT) is often unsteady. The rotating speed of a PAT constantly varies as the flow and load change, resulting in transient hydrodynamic behaviors between different working conditions. During the transition, the PAT undergoes a severe change in performance and complicated internal flow structures. In previous work, the fixed rotating speed of a PAT was mostly considered using computational fluid dynamics. To investigate the transient behavior of a PAT, relevant simulation tools are developed to depict transient flow conditions, and the corresponding transient speed of the impeller is calculated. Both large and small fluctuation transitions are simulated for the practical application of the PAT. The simulated results are first verified by experiments. The results show that the rotating speed significantly affects the performance and stability of the PAT. The rapid increment in flow rate and rotating speed lead to large energy dissipation in the internal flow field of the PAT. The range of high efficiency of the PAT expands and migrates to the high flow rate range. The efficiency in the transition condition started a cyclic growth after the flow reached 60 m 3 /h, and it reached a peak at around 80 m 3 /h, which was about 5% lower than the calculated value in a quasi-steady state. In the range of high rotating speeds, the rotating speed of the impeller and the operational stability are sensitive to flow fluctuation. The internal flow fields during transition conditions are analyzed as well. The obtained results can be utilized as a reference for studying the hydrodynamic characteristics and stability of fluid machinery in the transition under transient flow conditions.

Suggested Citation

  • Jianxin Hu & Wenfeng Su & Ke Li & Kexin Wu & Ling Xue & Guolei He, 2023. "Transient Hydrodynamic Behavior of a Pump as Turbine with Varying Rotating Speed," Energies, MDPI, vol. 16(4), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:4:p:2071-:d:1074705
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    References listed on IDEAS

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    1. Sheng Chen & Jian Zhang & Gaohui Li & Xiaodong Yu, 2019. "Influence Mechanism of Geometric Characteristics of Water Conveyance System on Extreme Water Hammer during Load Rejection in Pumped Storage Plants," Energies, MDPI, vol. 12(15), pages 1-22, July.
    2. Su, Xianghui & Huang, Si & Zhang, Xuejiao & Yang, Sunsheng, 2016. "Numerical research on unsteady flow rate characteristics of pump as turbine," Renewable Energy, Elsevier, vol. 94(C), pages 488-495.
    3. Feng, Jianjun & Ge, Zhenguo & Zhang, Yu & Zhu, Guojun & Wu, Guangkuan & Lu, Jinling & Luo, Xingqi, 2021. "Numerical investigation on characteristics of transient process in centrifugal pumps during power failure," Renewable Energy, Elsevier, vol. 170(C), pages 267-276.
    4. Kong, Yigang & Kong, Zhigang & Liu, Zhiqi & Wei, Congmei & Zhang, Jingfang & An, Gaocheng, 2017. "Pumped storage power stations in China: The past, the present, and the future," Renewable and Sustainable Energy Reviews, Elsevier, vol. 71(C), pages 720-731.
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    Cited by:

    1. João M. R. Catelas & João F. P. Fernandes & Modesto Pérez-Sánchez & P. Amparo López-Jiménez & Helena M. Ramos & P. J. Costa Branco, 2024. "Energy Efficiency and Stability of Micro-Hydropower PAT-SEIG Systems for DC Off-Grids," Energies, MDPI, vol. 17(6), pages 1-25, March.
    2. Stefanizzi, M. & Filannino, D. & Capurso, T. & Camporeale, S.M. & Torresi, M., 2023. "Optimal hydraulic energy harvesting strategy for PaT installation in Water Distribution Networks," Applied Energy, Elsevier, vol. 344(C).
    3. Lin, Tong & Zhang, Jiajing & Wei, Bisheng & Zhu, Zuchao & Li, Xiaojun, 2024. "The role of bionic tubercle leading-edge in a centrifugal pump as turbines(PATs)," Renewable Energy, Elsevier, vol. 222(C).
    4. Abdulbasit Nasir & Edessa Dribssa & Misrak Girma & Habtamu Bayera Madessa, 2023. "Selection and Performance Prediction of a Pump as a Turbine for Power Generation Applications," Energies, MDPI, vol. 16(13), pages 1-16, June.

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