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Research on the mechanism of the effect of vortex on the hydraulic loss of pump as turbine units based on entropy production theory

Author

Listed:
  • Song, Xijie
  • Wang, Zhengwei
  • Jin, Yan
  • Liu, Chao
  • Presas, Alexandre
  • Tang, Fangping
  • Lu, Yonggang

Abstract

Pump as turbine (PAT) is a common method of energy recovery, however, vortices are a negative phenom for these units. The objective of this research is to study the effect of vortex motion on the hydraulic loss of pump as turbine, and establishing the correlation mechanism between vortex intensity and turbulence loss. The research method adopts theoretical analysis and model test and numerical simulation. Based on the entropy production theory, the hydraulic loss and the turbulent dissipation in boundary layer induced by vortex motion are studied, revealing the influence of vortices on the energy loss. Results show that the vortex motion can be decomposed into a synchronous component v˜sy and a rotational component v˜ro, among them, the rotational component v˜ro meets to Biot-Savart Law. The turbulent dissipation rate in the boundary layer is closely to the vortex motion, which can characterize the boundary turbulence height. Turbulent flow induced by vortex can propagate in the flow channel of the unit, causing lot of additional hydraulic loss. In the end, a mathematical model between entropy production (Sk) induced by vortex and vortex strength (Гk) was established, indicating that Sk changes with Гk in the form of a quadratic function.

Suggested Citation

  • Song, Xijie & Wang, Zhengwei & Jin, Yan & Liu, Chao & Presas, Alexandre & Tang, Fangping & Lu, Yonggang, 2025. "Research on the mechanism of the effect of vortex on the hydraulic loss of pump as turbine units based on entropy production theory," Renewable Energy, Elsevier, vol. 239(C).
    • Handle: RePEc:eee:renene:v:239:y:2025:i:c:s0960148124021165
    DOI: 10.1016/j.renene.2024.122048
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    References listed on IDEAS

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    1. Yu, An & Tang, Yibo & Tang, Qinghong & Cai, Jianguo & Zhao, Lei & Ge, Xinfeng, 2022. "Energy analysis of Francis turbine for various mass flow rate conditions based on entropy production theory," Renewable Energy, Elsevier, vol. 183(C), pages 447-458.
    2. Zhang, Juntao & Cheng, Chuntian & Yu, Shen & Shen, Jianjian & Wu, Xinyu & Su, Huaying, 2022. "Preliminary feasibility analysis for remaking the function of cascade hydropower stations to enhance hydropower flexibility: A case study in China," Energy, Elsevier, vol. 260(C).
    3. Haisheng Hu & Wanhao Dong, 2022. "The Goal of Carbon Peaking, Carbon Emissions, and the Economic Effects of China’s Energy Planning Policy: Analysis Using a CGE Model," IJERPH, MDPI, vol. 20(1), pages 1-20, December.
    4. Song, Xijie & Liu, Chao, 2021. "Experimental study of the floor-attached vortices in pump sump using V3V," Renewable Energy, Elsevier, vol. 164(C), pages 752-766.
    5. Song, Xijie & Liu, Chao, 2020. "Experimental investigation of floor-attached vortex effects on the pressure pulsation at the bottom of the axial flow pump sump," Renewable Energy, Elsevier, vol. 145(C), pages 2327-2336.
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    1. Kan, Kan & Liu, Kunting & Xu, Zhe & Li, Zhixiang & Rossi, Mosè & Chen, Huixiang, 2025. "Fluid deformation induced energy loss of pump-turbines based on the transport of mean kinetic energy," Renewable Energy, Elsevier, vol. 248(C).
    2. Peng Lin & Yuting Xiong & Xiaolong Li & Yonggang Lu & Dong Hu & Wei Lu & Jin Peng, 2025. "Transient Flow Structures and Energy Loss Mechanisms of a Multistage Pump as a Turbine Under Runaway Conditions," Energies, MDPI, vol. 18(17), pages 1-21, August.

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