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Numerical Analysis of Mechanical Energy Dissipation for an Axial-Flow Pump Based on Entropy Generation Theory

Author

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  • Simin Shen

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 South East Lake Road, Wuhan 430072, China)

  • Zhongdong Qian

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 South East Lake Road, Wuhan 430072, China)

  • Bin Ji

    (State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, No.8 South East Lake Road, Wuhan 430072, China)

Abstract

Mechanical energy dissipation is a major problem affecting hydraulic machinery especially under partial-load conditions. Owing to limitations of traditional methods in evaluating mechanical energy dissipation, entropy generation theory is introduced to study mechanical energy dissipation with varying discharge and tip clearance intuitively through numerical simulations in an axial-flow pump. Results show that the impeller and diffuser are the main domains of mechanical energy dissipation, respectively accounting for 35.32%–55.51% and 32.61%–20.42% of mechanical energy dissipation throughout the flow passage. The mechanical energy dissipation of the impeller has a strong relation with the hump characteristic and becomes increasingly important with decreasing discharge. Areas of high turbulent dissipation in the impeller are mainly concentrated near the blades’ suction sides, and these regions, especially areas near the shroud, extend with decreasing discharge. When the pump enters the hump region, the distributions of turbulent dissipation near the shroud become disordered and expand towards the impeller’s inlet side. Unstable flows, like flow separation and vortices, near the blades’ suction sides lead to the high turbulent dissipation in the impeller and hump characteristic. Turbulent dissipation at the tip decreases from the blade leading edge to trailing edge, and regions of high dissipation distribute near the leading edge of the blade tip side. An increase in tip clearance for the same discharge mainly increases areas of high turbulent dissipation near the shroud and at the tip of the impeller, finally reducing pump performance.

Suggested Citation

  • Simin Shen & Zhongdong Qian & Bin Ji, 2019. "Numerical Analysis of Mechanical Energy Dissipation for an Axial-Flow Pump Based on Entropy Generation Theory," Energies, MDPI, vol. 12(21), pages 1-22, October.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4162-:d:282078
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    References listed on IDEAS

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    1. Qian, Zhongdong & Wang, Fan & Guo, Zhiwei & Lu, Jie, 2016. "Performance evaluation of an axial-flow pump with adjustable guide vanes in turbine mode," Renewable Energy, Elsevier, vol. 99(C), pages 1146-1152.
    2. Yabin Liu & Lei Tan & Yue Hao & Yun Xu, 2017. "Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes," Energies, MDPI, vol. 10(2), pages 1-15, February.
    3. Li, Deyou & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu & Qin, Daqing, 2018. "Numerical simulation of hysteresis characteristic in the hump region of a pump-turbine model," Renewable Energy, Elsevier, vol. 115(C), pages 433-447.
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    Cited by:

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    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).
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    5. Jin, Faye & Luo, Yongyao & Wang, Zhengwei, 2024. "Research on the starting-up process of a prototype reversible pump turbine with misaligned guide vanes: An energy loss analysis," Energy, Elsevier, vol. 304(C).
    6. Mu, Tong & Zhang, Rui & Xu, Hui & Fei, Zhaodan & Feng, Jiangang & Jin, Yan & Zheng, Yuan, 2023. "Improvement of energy performance of the axial-flow pump by groove flow control technology based on the entropy theory," Energy, Elsevier, vol. 274(C).
    7. Maxime Binama & Kan Kan & Huixiang Chen & Yuan Zheng & Daqing Zhou & Alexis Muhirwa & Godfrey M. Bwimba, 2021. "Investigation into Pump Mode Flow Dynamics for a Mixed Flow PAT with Adjustable Runner Blades," Energies, MDPI, vol. 14(9), pages 1-28, May.
    8. Jin, Faye & Luo, Yongyao & Zhao, Qiang & Cao, Jiali & Wang, Zhengwei, 2023. "Energy loss analysis of transition simulation for a prototype reversible pump turbine during load rejection process," Energy, Elsevier, vol. 284(C).

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