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Investigations of the thermodynamic entropy evaluation in a hydraulic turbine under various operating conditions

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  • Yu, An
  • Tang, Qinghong
  • Chen, Huixiang
  • Zhou, Daqing

Abstract

The irreversible energy loss due to viscous and turbulent dissipation in a Francis turbine led to a decrease in efficiency. It is difficult to reveal the detailed energy loss distribution by either experimental method or traditional simulation method. In this investigation, the entropy production method is applied to calculate the irreversible energy loss quantitatively and demonstrate the spatial distribution of energy loss intuitively. The flow in the Francis turbine is numerically simulated based on SST turbulence model and Zwart cavitation model. The objectives of this study are to (1) verify the accuracy of entropy production method in irreversible energy loss calculation, (2) investigate the detailed characteristics of entropy production rate in blade channel, blade surface and draft tube, (3) reveal the internal interaction mechanism between cavitation process and entropy production rate generation. The results show that the entropy production method has a credible accuracy for irreversible energy loss calculation. Draft tube and runner have the maximum amount of energy loss, but the guide vanes and runner have the maximum ability of irreversible energy loss generation. Finally, the new definition of entropy production rate induced by cavitation is derived to reveal the interaction mechanism between cavitation process and entropy production rate.

Suggested Citation

  • Yu, An & Tang, Qinghong & Chen, Huixiang & Zhou, Daqing, 2021. "Investigations of the thermodynamic entropy evaluation in a hydraulic turbine under various operating conditions," Renewable Energy, Elsevier, vol. 180(C), pages 1026-1043.
    • Handle: RePEc:eee:renene:v:180:y:2021:i:c:p:1026-1043
    DOI: 10.1016/j.renene.2021.07.041
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    References listed on IDEAS

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    1. 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.
    2. Florian Ries & Yongxiang Li & Dario Klingenberg & Kaushal Nishad & Johannes Janicka & Amsini Sadiki, 2018. "Near-Wall Thermal Processes in an Inclined Impinging Jet: Analysis of Heat Transport and Entropy Generation Mechanisms," Energies, MDPI, vol. 11(6), pages 1-23, May.
    3. Sciacovelli, A. & Verda, V. & Sciubba, E., 2015. "Entropy generation analysis as a design tool—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1167-1181.
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    Cited by:

    1. Zhumei Luo & Cong Nie & Shunli Lv & Tao Guo & Suoming Gao, 2022. "The Effect of J-Groove on Vortex Suppression and Energy Dissipation in a Draft Tube of Francis Turbine," Energies, MDPI, vol. 15(5), pages 1-20, February.
    2. Zhou, Ling & Hang, Jianwei & Bai, Ling & Krzemianowski, Zbigniew & El-Emam, Mahmoud A. & Yasser, Eman & Agarwal, Ramesh, 2022. "Application of entropy production theory for energy losses and other investigation in pumps and turbines: A review," Applied Energy, Elsevier, vol. 318(C).
    3. 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.
    4. Wang, Zhiqi & Xie, Baoqi & Xia, Xiaoxia & Luo, Lan & Yang, Huya & Li, Xin, 2023. "Entropy production analysis of a radial inflow turbine with variable inlet guide vane for ORC application," Energy, Elsevier, vol. 265(C).

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