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Numerical study on the energy evaluation characteristics in a pump turbine based on the thermodynamic entropy theory

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  • Yu, An
  • Li, Longwei
  • Ji, Jingjing
  • Tang, Qinghong

Abstract

Pumped storage power stations have attracted more and more attention in recent years. As the core component, the performance of pump-turbine has a strong connection with the station's economic effectiveness. The energy evaluation characteristics in a pump turbine are deeply investigated based on the entropy generation theory which has a great advantage to the traditional pressure drop method. The multiphase flow in the pump-turbine under several classical operating conditions are simulated using a modified turbulence model. Cavitation's contribution in energy loss is also considered in the entropy generation theory. Compared with the traditional differential pressure method, the accuracy of entropy generation method is verified. Then, the internal energy loss distribution along the pump-turbine passage at different flow rates are obtained. According to the result, the hydraulic loss mainly occurs in the runner, followed by guide vanes and stay vanes. In the runner, most of the energy loss is distributed in the channel near the lower ring, and the pressure surface is lower than that of the suction surface. The results also show that the stable attached cavity can wrap the blade and reduce friction resistance, and then reduce the wall entropy production value.

Suggested Citation

  • Yu, An & Li, Longwei & Ji, Jingjing & Tang, Qinghong, 2022. "Numerical study on the energy evaluation characteristics in a pump turbine based on the thermodynamic entropy theory," Renewable Energy, Elsevier, vol. 195(C), pages 766-779.
    • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:766-779
    DOI: 10.1016/j.renene.2022.06.077
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    References listed on IDEAS

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    1. Yu, An & Wang, Yongshuai & Tang, Qinghong & Lv, Ruirui & Yang, Zhongpo, 2021. "Investigation of the vortex evolution and hydraulic excitation in a pump-turbine operating at different conditions," Renewable Energy, Elsevier, vol. 171(C), pages 462-478.
    2. Sotoude Haghighi, Mohammad Hadi & Mirghavami, Seyed Mohammad & Ghorani, Mohammad Mahdi & Riasi, Alireza & Chini, Seyed Farshid, 2020. "A numerical study on the performance of a superhydrophobic coated very low head (VLH) axial hydraulic turbine using entropy generation method," Renewable Energy, Elsevier, vol. 147(P1), pages 409-422.
    3. Yu, An & Zou, Zhipeng & Zhou, Daqing & Zheng, Yuan & Luo, Xianwu, 2020. "Investigation of the correlation mechanism between cavitation rope behavior and pressure fluctuations in a hydraulic turbine," Renewable Energy, Elsevier, vol. 147(P1), pages 1199-1208.
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    Cited by:

    1. Hu, Jinhong & Zhao, Zhigao & He, Xianghui & Zeng, Wei & Yang, Jiebin & Yang, Jiandong, 2023. "Design techniques for improving energy performance and S-shaped characteristics of a pump-turbine with splitter blades," Renewable Energy, Elsevier, vol. 212(C), pages 333-349.
    2. Hu, Jinhong & Yang, Jiebin & He, Xianghui & Zeng, Wei & Zhao, Zhigao & Yang, Jiandong, 2023. "Transition of amplitude–frequency characteristic in rotor–stator interaction of a pump-turbine with splitter blades," Renewable Energy, Elsevier, vol. 205(C), pages 663-677.
    3. 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.

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