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Numerical and experimental investigations on inflow loss in the energy recovery turbines with back-curved and front-curved impeller based on the entropy generation theory

Author

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  • Qi, Bing
  • Zhang, Desheng
  • Geng, Linlin
  • Zhao, Ruijie
  • van Esch, Bart P.M.

Abstract

Pump as turbine (PAT) is one of the economical and effective energy recovery devices in small hydropower stations. A back-curved PAT and a front-curved PAT were designed, and performance characteristics were studied, the accuracy of the numerical calculation was verified by comparing with the experimental results. The entropy generation theory was used to compare performance and energy loss of PATs. The results show that the high efficiency range of front-curved PAT is significantly wider than that of back-curved PAT. Under part-load condition (0.8Qd), design flow condition (1.0Qd) and over-load condition (1.2Qd), the efficiency of the front-curved PAT is 0.6%, 5.9% and 7.9% higher than that of the back-curved PAT, respectively. The energy loss in the PAT impeller mainly comes from the turbulent entropy generation rate which is mainly concentrated on the blade leading edge and trailing edge. Flow separation and flow impact caused by the mismatch between the relative flow angle and the blade setting angle are the main mechanisms of energy loss in impeller. In addition, the loss caused by the wall friction in the front-curved impeller is less than that in the back-curved impeller. Therefore, the entropy generation theory can provide guidance for the performance optimization of PAT.

Suggested Citation

  • Qi, Bing & Zhang, Desheng & Geng, Linlin & Zhao, Ruijie & van Esch, Bart P.M., 2022. "Numerical and experimental investigations on inflow loss in the energy recovery turbines with back-curved and front-curved impeller based on the entropy generation theory," Energy, Elsevier, vol. 239(PE).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pe:s036054422102675x
    DOI: 10.1016/j.energy.2021.122426
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    References listed on IDEAS

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    Cited by:

    1. Shojaeefard, Mohammad Hassan & Saremian, Salman, 2023. "Studying the impact of impeller geometrical parameters on the high-efficiency working range of pump as turbine (PAT) installed in the water distribution network," Renewable Energy, Elsevier, vol. 216(C).
    2. Chen, Weisheng & Li, Yaojun & Liu, Zhuqing & Hong, Yiping, 2023. "Understanding of energy conversion and losses in a centrifugal pump impeller," Energy, Elsevier, vol. 263(PB).
    3. Shojaeefard, Mohammad Hassan & Saremian, Salman, 2022. "Effects of impeller geometry modification on performance of pump as turbine in the urban water distribution network," Energy, Elsevier, vol. 255(C).
    4. Song, Daiwang & Zhou, Jie & Wang, Shenghui & Wang, Chengpeng & Liu, Sihan & Zhang, Yin & Tian, Lin & Xiao, Yexiang, 2023. "Adaptability evaluation of piston type high pressure pump integrated with energy recovery device through the numerical simulation and one year's island desalination," Energy, Elsevier, vol. 262(PA).
    5. Yang, Gang & Shen, Xi & Shi, Lei & Zhang, Desheng & Zhao, Xutao & (Bart) van Esch, B.P.M., 2023. "Numerical investigation of hump characteristic improvement in a large vertical centrifugal pump with special emphasis on energy loss mechanism," Energy, Elsevier, vol. 273(C).
    6. Lu, Zhaoheng & Tao, Ran & Yao, Zhifeng & Liu, Weichao & Xiao, Ruofu, 2022. "Effects of guide vane shape on the performances of pump-turbine: A comparative study in energy storage and power generation," Renewable Energy, Elsevier, vol. 197(C), pages 268-287.
    7. Wang, Tao & Yu, He & Xiang, Ru & Chen, XiaoMing & Zhang, Xiang, 2023. "Performance and unsteady flow characteristic of forward-curved impeller with different blade inlet swept angles in a pump as turbine," Energy, Elsevier, vol. 282(C).

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