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Dynamic characteristics of load rejection process in a reversible pump-turbine

Author

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  • Liu, Quan-Zhong
  • Su, Wen-Tao
  • Li, Xiao-Bin
  • Zhang, Ya-Ning

Abstract

The dynamic behavior during load rejection process of a reversible pump-turbine is numerically investigated based on the dynamic grid method. For the dynamic characteristics, the external features like runner rotation speed, torque and flow rate are analyzed. Then the time-frequency characteristics of pressure fluctuations at different positions (like guide vane, vaneless space, runner inlet and draft tube) are discussed in details. During the unsteady process of load rejection, four peculiar frequency bands, are identified and their sources are assessed. These frequency bands are 2 low frequency-high amplitude components, marked as zones a and b, which occur around the zero-torque condition. Another 2 high frequency-high amplitude components, marked as zones c and d, appear near the maximum reversed flow condition. Besides, the rotor-stator interaction plays an important role in the pressure pulsation bands distribution, showing components multiples of runner rotational frequency. They could propagate towards both upstream and downstream. For reversed flow condition, it is also found that the entrance flow from draft tube into runner contributes most energy to the pressure fluctuations.

Suggested Citation

  • Liu, Quan-Zhong & Su, Wen-Tao & Li, Xiao-Bin & Zhang, Ya-Ning, 2020. "Dynamic characteristics of load rejection process in a reversible pump-turbine," Renewable Energy, Elsevier, vol. 146(C), pages 1922-1931.
    • Handle: RePEc:eee:renene:v:146:y:2020:i:c:p:1922-1931
    DOI: 10.1016/j.renene.2019.08.038
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    References listed on IDEAS

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    Cited by:

    1. Su, Wen-Tao & Li, Xiao-Bin & Xia, Yu-Xing & Liu, Quan-Zhong & Binama, Maxime & Zhang, Ya-Ning, 2021. "Pressure fluctuation characteristics of a model pump-turbine during runaway transient," Renewable Energy, Elsevier, vol. 163(C), pages 517-529.
    2. Chen, Huixiang & Zhou, Daqing & Kan, Kan & Guo, Junxun & Zheng, Yuan & Binama, Maxime & Xu, Zhe & Feng, Jiangang, 2021. "Transient characteristics during the co-closing guide vanes and runner blades of a bulb turbine in load rejection process," Renewable Energy, Elsevier, vol. 165(P2), pages 28-41.
    3. Lei, Liuwei & Li, Feng & Xu, Beibei & Egusquiza, Mònica & Luo, Xingqi & Zhang, Junzhi & Egusquiza, Eduard & Chen, Diyi & Jiang, Wei & Patelli, Edoardo, 2022. "Time-frequency domain characteristics analysis of a hydro-turbine governor system considering vortex rope excitation," Renewable Energy, Elsevier, vol. 183(C), pages 172-187.
    4. Chen, Zhenmu & Jiang, Zhenyu & Chen, Shuai & Zhang, Wenwu & Zhu, Baoshan, 2023. "Experimental and numerical study on flow instability of pump-turbine under runaway conditions," Renewable Energy, Elsevier, vol. 210(C), pages 335-345.
    5. Sun, Longgang & Guo, Pengcheng & Yan, Jianguo, 2021. "Transient analysis of load rejection for a high-head Francis turbine based on structured overset mesh," Renewable Energy, Elsevier, vol. 171(C), pages 658-671.
    6. Jin, Faye & Luo, Yongyao & Zhao, Qiang & Cao, Jiali & Wang, Zhengwei, 2023. "Energy loss analysis of transition simulation for a prototype reversible pump turbine during load rejection process," Energy, Elsevier, vol. 284(C).
    7. 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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