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Evolutions of flow patterns and pressure fluctuations in a prototype pump-turbine during the runaway transient process after pump-trip

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  • Yang, Zhiyan
  • Cheng, Yongguang
  • Xia, Linsheng
  • Meng, Wanwan
  • Liu, Ke
  • Zhang, Xiaoxi

Abstract

The runaway after pump-trip is a fast transient process, during which unit vibrations, water-hammer fluctuations, pressure pulsation changes and flow pattern transitions happen violently, endangering pump-turbine units of pumped-storage power stations. In this paper, based on validated CFD data from 1D-3D coupled simulation, we describe the evolutions of flow patterns and pressure fluctuations in a prototype pump-turbine during this working point fast sliding process, and try to reveal the influence mechanism of flow pattern transitions on pressure fluctuation changes. The results show that the general evolutions of flow patterns are dominated by the changes of the runner velocity triangles, which are controlled by the changes of the discharge and rotational speed. Inhomogeneous local flow also contributes to abundant local vortex structures, such as rotating-stall vortices in the vane and runner regions, skirt and helical vortices in the draft-tube, separation vortices in the blade channels, and the impinging jets on the blade surfaces. These unstable vortices appear, change, and vanish in a fast transitional and uneven manner, leading to great differences in pressure and runner force fluctuations in different working regions.

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  • Yang, Zhiyan & Cheng, Yongguang & Xia, Linsheng & Meng, Wanwan & Liu, Ke & Zhang, Xiaoxi, 2020. "Evolutions of flow patterns and pressure fluctuations in a prototype pump-turbine during the runaway transient process after pump-trip," Renewable Energy, Elsevier, vol. 152(C), pages 1149-1159.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:1149-1159
    DOI: 10.1016/j.renene.2020.01.079
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    References listed on IDEAS

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    Cited by:

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    6. Xiaoxia Hou & Yongguang Cheng & Zhiyan Yang & Ke Liu & Xiaoxi Zhang & Demin Liu, 2021. "Influence of Clearance Flow on Dynamic Hydraulic Forces of Pump-Turbine during Runaway Transient Process," Energies, MDPI, vol. 14(10), pages 1-20, May.
    7. Jonathan Fahlbeck & Håkan Nilsson & Saeed Salehi, 2021. "Flow Characteristics of Preliminary Shutdown and Startup Sequences for a Model Counter-Rotating Pump-Turbine," Energies, MDPI, vol. 14(12), pages 1-17, June.
    8. 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.
    9. Binama, Maxime & Kan, Kan & Chen, Hui-Xiang & Zheng, Yuan & Zhou, Daqing & Su, Wen-Tao & Muhirwa, Alexis & Ntayomba, James, 2021. "Flow instability transferability characteristics within a reversible pump turbine (RPT) under large guide vane opening (GVO)," Renewable Energy, Elsevier, vol. 179(C), pages 285-307.
    10. 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.
    11. Liu, Demin & Zhang, Xiaoxi & Yang, Zhiyan & Liu, Ke & Cheng, Yongguang, 2021. "Evaluating the pressure fluctuations during load rejection of two pump-turbines in a prototype pumped-storage system by using 1D-3D coupled simulation," Renewable Energy, Elsevier, vol. 171(C), pages 1276-1289.
    12. 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).
    13. Zhang, Xiaoxi & Cheng, Yongguang & Yang, Zhiyan & Chen, Qiuhua & Liu, Demin, 2021. "Water column separation in pump-turbine after load rejection: 1D-3D coupled simulation of a model pumped-storage system," Renewable Energy, Elsevier, vol. 163(C), pages 685-697.
    14. Zhou, Xing & Wu, Hegao & Cheng, Li & Huang, Quanshui & Shi, Changzheng, 2023. "A new draft tube shape optimisation methodology of introducing inclined conical diffuser in hydraulic turbine," Energy, Elsevier, vol. 265(C).
    15. Zhiyan Yang & Zirui Liu & Yongguang Cheng & Xiaoxi Zhang & Ke Liu & Linsheng Xia, 2020. "Differences of Flow Patterns and Pressure Pulsations in Four Prototype Pump-Turbines during Runaway Transient Processes," Energies, MDPI, vol. 13(20), pages 1-20, October.

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