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Effect mechanism of cavitation on the hump characteristic of a pump-turbine

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  • Li, Deyou
  • Song, Yechen
  • Lin, Song
  • Wang, Hongjie
  • Qin, Yonglin
  • Wei, Xianzhu

Abstract

In order to find out the effect mechanism of the cavitation on the hump characteristic of pump-turbines, three dimensional numerical simulations with and without cavitation were carried out using the SST (shear stress transport) k-ω turbulence model and ZGB (Zwart-Gerber-Belamri) cavitation model. Numerical results agreed well with the performance characteristic and flow visualization results. Under cavitation conditions, the simulations with cavitation obtained a more accuracy prediction on the hump characteristic. The relationship between the performance characteristics and the cavitation was analyzed in details. A cavitation condition (cavitation coefficient is 0.14), under which the cavitation just occurs, was selected to investigate the hump characteristic. The occurrence position of the cavitation and the variation law with the cavitation coefficient were obtained. The hump characteristic is related to the cavitation on suction surfaces close to the leading edges of the blades at the runner inlet. The action mechanism of the cavitation on the change of the hump characteristic was revealed. The sudden increase of the cavitation in the hump region leads to the decrease in the Euler head and the increase in the hydraulic loss, resulting in the drop of the head. Detailed analyses reveal that the occurrence of the cavitation will block the runner passages, which reduces the working ability of the runner and induces large size vortices in the adjacent passages.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:167:y:2021:i:c:p:369-383
    DOI: 10.1016/j.renene.2020.11.095
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    References listed on IDEAS

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    2. Yang, Fan & Li, Zhongbin & Yuan, Yao & Lin, Zhikang & Zhou, Guangxin & Ji, Qingwei, 2022. "Study on vortex flow and pressure fluctuation in dustpan-shaped conduit of a low head axial-flow pump as turbine," Renewable Energy, Elsevier, vol. 196(C), pages 856-869.
    3. 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.
    4. Dehghan, Amir Arsalan & Shojaeefard, Mohammad Hassan & Roshanaei, Maryam, 2024. "Exploring a new criterion to determine the onset of cavitation in centrifugal pumps from energy-saving standpoint; experimental and numerical investigation," Energy, Elsevier, vol. 293(C).
    5. Zheng, Xianghao & Zhang, Suqi & Zhang, Yuning & Li, Jinwei & Zhang, Yuning, 2023. "Dynamic characteristic analysis of pressure pulsations of a pump turbine in turbine mode utilizing variational mode decomposition combined with Hilbert transform," Energy, Elsevier, vol. 280(C).
    6. Zhao, Yuanqi & Li, Deyou & Chang, Hong & Fu, Xiaolong & Wang, Hongjie & Qin, Daqing, 2023. "Suppression effect of bionic guide vanes with different parameters on the hump characteristics of pump-turbines based on entropy production theory," Energy, Elsevier, vol. 283(C).
    7. Yonglin Qin & Deyou Li & Hongjie Wang & Xianzhu Wei, 2023. "Optimization of Setting Angle Distribution to Suppress Hump Characteristic in Pump Turbine," Energies, MDPI, vol. 16(5), pages 1-18, March.
    8. Lijian Shi & Jun Zhu & Li Wang & Shiji Chu & Fangping Tang & Yan Jin, 2021. "Comparative Analysis of Strength and Modal Characteristics of a Full Tubular Pump and an Axial Flow Pump Impellers Based on Fluid-Structure Interaction," Energies, MDPI, vol. 14(19), pages 1-18, October.
    9. Zhiyan Yang & Yongguang Cheng & Ke Liu & Xiaoxia Hou & Xiaoxi Zhang & Xi Wang & Jinghuan Ding, 2021. "Three-Dimensional CFD Simulations of Start-Up Processes of a Pump-Turbine Considering Governor Regulation," Energies, MDPI, vol. 14(24), pages 1-19, December.
    10. Li, Deyou & Qin, Yonglin & Wang, Jianpeng & Zhu, Yutong & Wang, Hongjie & Wei, Xianzhu, 2022. "Optimization of blade high-pressure edge to reduce pressure fluctuations in pump-turbine hump region," Renewable Energy, Elsevier, vol. 181(C), pages 24-38.
    11. Raluca Gabriela Iovănel & Arash Soltani Dehkharqani & Diana Maria Bucur & Michel Jose Cervantes, 2022. "Numerical Simulation and Experimental Validation of a Kaplan Prototype Turbine Operating on a Cam Curve," Energies, MDPI, vol. 15(11), pages 1-24, June.

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