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Numerical investigation on characteristics of transient process in centrifugal pumps during power failure

Author

Listed:
  • Feng, Jianjun
  • Ge, Zhenguo
  • Zhang, Yu
  • Zhu, Guojun
  • Wu, Guangkuan
  • Lu, Jinling
  • Luo, Xingqi

Abstract

Centrifugal pumps are widely applied in engineering practices. Power failure occurs occasionally and consequently the flow field inside the pump is extremely complex. Pump parameters fluctuate greatly with time during power failure, and such fluctuations cause high pressure pulsations in the flow and vibrations in the pump system. In this work, the transient process caused by the power failure of a centrifugal pump is simulated using ANSYS CFX, along with a user-defined function developed to solve iteratively the angular momentum equation for calculating pump rotational speed. Experiments are conducted to obtain the external characteristic curves and pump runaway parameters. Results show that the characteristic curves and runaway parameters of the pump predicted by numerical simulations are in good agreement with experimental ones. After power failure, the transient process experiences mainly four modes, namely, pump mode, braking mode, turbine mode and runaway mode. The variations of pump characteristic parameters with time are examined in detail. Furthermore, internal flow fields during the transient process are analyzed and compared to improve the understanding of flow behavior after pump power failure.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:170:y:2021:i:c:p:267-276
    DOI: 10.1016/j.renene.2021.01.104
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    Citations

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    Cited by:

    1. Kan, Kan & Xu, Zhe & Chen, Huixiang & Xu, Hui & Zheng, Yuan & Zhou, Daqing & Muhirwa, Alexis & Maxime, Binama, 2022. "Energy loss mechanisms of transition from pump mode to turbine mode of an axial-flow pump under bidirectional conditions," Energy, Elsevier, vol. 257(C).
    2. 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.
    3. Wang, Wenjie & Guo, Hailong & Zhang, Chenying & Shen, Jiawei & Pei, Ji & Yuan, Shouqi, 2023. "Transient characteristics of PAT in micro pumped hydro energy storage during abnormal shutdown process," Renewable Energy, Elsevier, vol. 209(C), pages 401-412.
    4. Haoqing Jiang & Wei Dong & Peixuan Li & Haichen Zhang, 2023. "Based on Wavelet and Windowed Multi-Resolution Dynamic Mode Decomposition, Transient Axial Force Analysis of a Centrifugal Pump under Variable Operating Conditions," Energies, MDPI, vol. 16(20), pages 1-25, October.
    5. Xinfeng Ge & Jing Zhang & Jian Zhang & Demin Liu & Yuan Zheng & Huixiang Chen, 2022. "Review of Research on the Three-Dimensional Transition Process of Large-Scale Low-Lift Pump," Energies, MDPI, vol. 15(22), pages 1-34, November.
    6. He, Xianghui & Hu, Jinhong & Zhao, Zhigao & Lin, Jie & Xiao, Pengfei & Yang, Jiandong & Yang, Jiebin, 2023. "Water column separation under one-after-another load rejection in pumped storage station," Energy, Elsevier, vol. 278(C).

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