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Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine

Author

Listed:
  • Zijie Wang

    (Department of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, China)

  • Baoshan Zhu

    (Department of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, China)

  • Xuhe Wang

    (Department of Thermal Engineering, State Key Laboratory of Hydro Science and Engineering, Tsinghua University, Beijing 100084, China)

  • Daqing Qin

    (Harbin Institute of Large Electrical Machinery, Harbin 150040, China)

Abstract

Numerical simulations were performed to investigate pressure fluctuations in the S-shaped region of a pump-turbine model. Analyses focused on pressure fluctuations in the draft tube and in the gap between the guide vanes and runner. Calculations were made under six different operating conditions with a constant guide vane opening, and the best efficiency point, runaway point, and low-discharge point in the turbine brake zone were determined. The simulated results were compared with experimental measurements. In the draft tube, a twin vortex rope was observed. In the gap between the guide vanes and runner, a low frequency component was captured at both the runaway and low-discharge points in the turbine brake zone, which rotated at 65% of the runner frequency. This low frequency component was induced by the rotating stall phenomenon. At the runaway point, a single stall cell was found in the gap between the guide vanes and runner, while at the low-discharge point, four stall cells were observed.

Suggested Citation

  • Zijie Wang & Baoshan Zhu & Xuhe Wang & Daqing Qin, 2017. "Pressure Fluctuations in the S-Shaped Region of a Reversible Pump-Turbine," Energies, MDPI, vol. 10(1), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:96-:d:87801
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    References listed on IDEAS

    as
    1. Zuo, Zhigang & Fan, Honggang & Liu, Shuhong & Wu, Yulin, 2016. "S-shaped characteristics on the performance curves of pump-turbines in turbine mode – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 60(C), pages 836-851.
    2. Zhu, Baoshan & Wang, Xuhe & Tan, Lei & Zhou, Dongyue & Zhao, Yue & Cao, Shuliang, 2015. "Optimization design of a reversible pump–turbine runner with high efficiency and stability," Renewable Energy, Elsevier, vol. 81(C), pages 366-376.
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    Cited by:

    1. Linhai Liu & Baoshan Zhu & Li Bai & Xiaobing Liu & Yue Zhao, 2017. "Parametric Design of an Ultrahigh-Head Pump-Turbine Runner Based on Multiobjective Optimization," Energies, MDPI, vol. 10(8), pages 1-16, August.
    2. Jiawei Ye & Wei Zeng & Zhigao Zhao & Jiebin Yang & Jiandong Yang, 2020. "Optimization of Pump Turbine Closing Operation to Minimize Water Hammer and Pulsating Pressures During Load Rejection," Energies, MDPI, vol. 13(4), pages 1-18, February.
    3. Jianyong Hu & Qingbo Wang & Zhenzhu Meng & Hongge Song & Bowen Chen & Hui Shen, 2023. "Numerical Study of the Internal Fluid Dynamics of Draft Tube in Seawater Pumped Storage Hydropower Plant," Sustainability, MDPI, vol. 15(10), pages 1-17, May.
    4. Jianzhong Zhou & Zhigao Zhao & Chu Zhang & Chaoshun Li & Yanhe Xu, 2017. "A Real-Time Accurate Model and Its Predictive Fuzzy PID Controller for Pumped Storage Unit via Error Compensation," Energies, MDPI, vol. 11(1), pages 1-24, December.
    5. 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.
    6. Ma, Zhe & Zhu, Baoshan, 2020. "Pressure fluctuations in vaneless space of pump-turbines with large blade lean runners in the S- shaped region," Renewable Energy, Elsevier, vol. 153(C), pages 1283-1295.
    7. Zhang, Yuning & Zheng, Xianghao & Li, Jinwei & Du, Xiaoze, 2019. "Experimental study on the vibrational performance and its physical origins of a prototype reversible pump turbine in the pumped hydro energy storage power station," Renewable Energy, Elsevier, vol. 130(C), pages 667-676.
    8. Rui Xiong & Hailong Li & Xuan Zhou, 2017. "Advanced Energy Storage Technologies and Their Applications (AESA2017)," Energies, MDPI, vol. 10(9), pages 1-3, September.
    9. Zhang, Wenwu & Chen, Zhenmu & Zhu, Baoshan & Zhang, Fei, 2020. "Pressure fluctuation and flow instability in S-shaped region of a reversible pump-turbine," Renewable Energy, Elsevier, vol. 154(C), pages 826-840.
    10. Lu, Jie & Qian, Zhongdong & Lee, Young-Ho, 2021. "Numerical investigation of unsteady characteristics of a pump turbine under runaway condition," Renewable Energy, Elsevier, vol. 169(C), pages 905-924.
    11. 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.
    12. Jianzhong Zhou & Yanhe Xu & Yang Zheng & Yuncheng Zhang, 2017. "Optimization of Guide Vane Closing Schemes of Pumped Storage Hydro Unit Using an Enhanced Multi-Objective Gravitational Search Algorithm," Energies, MDPI, vol. 10(7), pages 1-23, July.

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