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Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine

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  • Lu, Guocheng
  • Zuo, Zhigang
  • Sun, Yuekun
  • Liu, Demin
  • Tsujimoto, Yoshinobu
  • Liu, Shuhong

Abstract

The positive slope on the pump performance curve of pump-turbines suggests potential operational instabilities in pump mode. Previous research has indicated that the positive slope instability can be affected by cavitation conditions, however the detailed influences remain poorly understood. A low specific speed model pump-turbine was systematically examined by experiments for the first time in the present study. A new finding was made that the positive slope is alleviated at the large guide vane opening with decreasing cavitation coefficient, while there is little influence by cavitation at the medium opening. The positive slope occurs at larger discharge coefficient at the small opening when the cavitation coefficient decreases. FFT (Fast Fourier Transformation) results of pressure fluctuations revealed the occurrence of rotating stall close to the vaneless space between the runner and the guide vanes. The variation of cavitation coefficient influences greatly on the occurrence of rotating stall, but the pressure fluctuation frequency caused by rotating stall does not vary significantly. It is postulated that the influence of cavitation coefficient on the rotating stall may be responsible for the variation of the positive slope region.

Suggested Citation

  • Lu, Guocheng & Zuo, Zhigang & Sun, Yuekun & Liu, Demin & Tsujimoto, Yoshinobu & Liu, Shuhong, 2017. "Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine," Renewable Energy, Elsevier, vol. 113(C), pages 1539-1550.
    • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:1539-1550
    DOI: 10.1016/j.renene.2017.06.099
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    References listed on IDEAS

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    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. Zuo, Zhigang & Liu, Shuhong & Sun, Yuekun & Wu, Yulin, 2015. "Pressure fluctuations in the vaneless space of High-head pump-turbines—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 965-974.
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    1. Sergey Skripkin & Zhigang Zuo & Mikhail Tsoy & Pavel Kuibin & Shuhong Liu, 2022. "Oscillation of Cavitating Vortices in Draft Tubes of a Simplified Model Turbine and a Model Pump–Turbine," Energies, MDPI, vol. 15(8), pages 1-18, April.
    2. Yangyang Wei & Yuhui Shi & Weidong Shi & Bo Pan, 2022. "Numerical Analysis and Experimental Study of Unsteady Flow Characteristics in an Ultra-Low Specific Speed Centrifugal Pump," Sustainability, MDPI, vol. 14(24), pages 1-15, December.
    3. Fan, Yading & Chen, Tairan & Liang, Wendong & Wang, Guoyu & Huang, Biao, 2022. "Numerical and theoretical investigations of the cavitation performance and instability for the cryogenic inducer," Renewable Energy, Elsevier, vol. 184(C), pages 291-305.
    4. Guocheng Lu & Zhigang Zuo & Demin Liu & Shuhong Liu, 2019. "Energy Balance and Local Unsteady Loss Analysis of Flows in a Low Specific Speed Model Pump-Turbine in the Positive Slope Region on the Pump Performance Curve," Energies, MDPI, vol. 12(10), pages 1-22, May.
    5. Cavazzini, Giovanna & Houdeline, Jean-Bernard & Pavesi, Giorgio & Teller, Olivier & Ardizzon, Guido, 2018. "Unstable behaviour of pump-turbines and its effects on power regulation capacity of pumped-hydro energy storage plants," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 399-409.
    6. Yuan, Zhiyi & Zhang, Yongxue & Zhang, Jinya & Zhu, Jianjun, 2021. "Experimental studies of unsteady cavitation at the tongue of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 177(C), pages 1265-1281.
    7. Li, Deyou & Song, Yechen & Lin, Song & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu, 2021. "Effect mechanism of cavitation on the hump characteristic of a pump-turbine," Renewable Energy, Elsevier, vol. 167(C), pages 369-383.
    8. Kan, Kan & Binama, Maxime & Chen, Huixiang & Zheng, Yuan & Zhou, Daqing & Su, Wentao & Muhirwa, Alexis, 2022. "Pump as turbine cavitation performance for both conventional and reverse operating modes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
    9. Li, Deyou & Zuo, Zhigang & Wang, Hongjie & Liu, Shuhong & Wei, Xianzhu & Qin, Daqing, 2019. "Review of positive slopes on pump performance characteristics of pump-turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 901-916.
    10. Li, Deyou & Chang, Hong & Zuo, Zhigang & Wang, Hongjie & Li, Zhenggui & Wei, Xianzhu, 2020. "Experimental investigation of hysteresis on pump performance characteristics of a model pump-turbine with different guide vane openings," Renewable Energy, Elsevier, vol. 149(C), pages 652-663.
    11. Wang, Cong & Zhang, Yongxue & Yuan, Zhiyi & Ji, Kaizhuo, 2020. "Development and application of the entropy production diagnostic model to the cavitation flow of a pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 154(C), pages 774-785.
    12. Liu, Ming & Tan, Lei & Cao, Shuliang, 2019. "Dynamic mode decomposition of cavitating flow around ALE 15 hydrofoil," Renewable Energy, Elsevier, vol. 139(C), pages 214-227.
    13. Ran, Hongjuan & Liu, Yong & Luo, Xianwu & Shi, Tianjiao & Xu, Yongliang & Chen, Yuanlin & Wang, Dezhong, 2020. "Experimental comparison of two different positive slopes in one single pump turbine," Renewable Energy, Elsevier, vol. 154(C), pages 1218-1228.
    14. 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.
    15. Zhu, Di & Xiao, Ruofu & Liu, Weichao, 2021. "Influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine," Renewable Energy, Elsevier, vol. 163(C), pages 939-949.

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