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Vortex evolution and energy loss of an axial flow Pump-As-Turbine (PAT) with the influence of upstream waves

Author

Listed:
  • Xu, Zhe
  • Zheng, Yuan
  • Kan, Kan
  • Pavesi, Giorgio
  • Rossi, Mosè
  • Xu, Lianchen
  • Yan, Xiaotong

Abstract

Pump-As-Turbine (PAT) technology is currently widely used in large-scale and small rural hydropower projects. However, its energy performance is inevitably affected by upstream flow state and this aspect deserves an in-depth investigation. For this reason, the entropy production method and Omega method are used to study the distributions of both the energy loss and vortices on a PAT with upstream waves. The Mean Entropy Production Rate (MEPR) and mean rotating vorticity ΩR are redefined to quantify the energy loss rate and vortex development while removing the non-uniformity in the integration regions. Results showed that the simulated external characteristics of the analyzed PAT at different operating conditions with no waves are in good accordance with the experimental data. Macroscopically, the trend of the vortices in the PAT along the mainstream direction is consistent with the energy loss; specifically, the MEPR and ΩR values peak in the impeller and decrease as they move away from it. Furthermore, the Energy Production Rate (EPR) is high at the vortex aggregation identified by the Omega method, meaning that the gathered vortices lead to large energy losses. The enhancement of the energy loss in the analyzed PAT with upstream waves gradually decreases from inlet to outlet with a maximum growth rate of MEPR of 96 % at the inlet. Regarding the impeller, the enhancement of upstream waves in the energy loss is limited, that is, the highest growth rate of MEPR was equal to 3.6 %. In the inlet pipe, shedding vortices are generated from the attached ones by the influence of upstream waves, and the generation period of the shedding vortices is the same as the upstream wave period.

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  • Xu, Zhe & Zheng, Yuan & Kan, Kan & Pavesi, Giorgio & Rossi, Mosè & Xu, Lianchen & Yan, Xiaotong, 2025. "Vortex evolution and energy loss of an axial flow Pump-As-Turbine (PAT) with the influence of upstream waves," Energy, Elsevier, vol. 322(C).
  • Handle: RePEc:eee:energy:v:322:y:2025:i:c:s0360544225013684
    DOI: 10.1016/j.energy.2025.135726
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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. Kan, Kan & Chen, Huixiang & Zheng, Yuan & Zhou, Daqing & Binama, Maxime & Dai, Jing, 2021. "Transient characteristics during power-off process in a shaft extension tubular pump by using a suitable numerical model," Renewable Energy, Elsevier, vol. 164(C), pages 109-121.
    3. Zuo, Zhigang & Liu, Shuhong & Sun, Yuekun & Wu, Yulin, 2015. "Pressure fluctuations in the vaneless space of High-head pump-turbines—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 965-974.
    4. 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).
    5. Ferraiuolo, Roberta & Pugliese, Francesco & Álvarez Álvarez, Eduardo & Yosry, Ahmed Gharib & Giugni, Maurizio & Del Giudice, Giuseppe, 2024. "Experimental and numerical investigation of a three-blade horizontal axis hydrokinetic water turbine (HAHWT) in high blockage conditions," Renewable Energy, Elsevier, vol. 237(PA).
    6. Nautiyal, Himanshu & Varun & Kumar, Anoop, 2010. "Reverse running pumps analytical, experimental and computational study: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(7), pages 2059-2067, September.
    7. Xu, Zhe & Zheng, Yuan & Kan, Kan & Chen, Huixiang, 2023. "Flow instability and energy performance of a coastal axial-flow pump as turbine under the influence of upstream waves," Energy, Elsevier, vol. 272(C).
    8. Kim, Joon-Hyung & Cho, Bo-Min & Kim, Sung & Kim, Jin-Woo & Suh, Jun-Won & Choi, Young-Seok & Kanemoto, Toshiaki & Kim, Jin-Hyuk, 2017. "Design technique to improve the energy efficiency of a counter-rotating type pump-turbine," Renewable Energy, Elsevier, vol. 101(C), pages 647-659.
    9. Yang, Sun-Sheng & Derakhshan, Shahram & Kong, Fan-Yu, 2012. "Theoretical, numerical and experimental prediction of pump as turbine performance," Renewable Energy, Elsevier, vol. 48(C), pages 507-513.
    10. Kan, Kan & Yang, Zixuan & Lyu, Pin & Zheng, Yuan & Shen, Lian, 2021. "Numerical study of turbulent flow past a rotating axial-flow pump based on a level-set immersed boundary method," Renewable Energy, Elsevier, vol. 168(C), pages 960-971.
    11. 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.
    12. Kinsey, Thomas & Dumas, Guy, 2017. "Impact of channel blockage on the performance of axial and cross-flow hydrokinetic turbines," Renewable Energy, Elsevier, vol. 103(C), pages 239-254.
    13. Ji, Leilei & Li, Wei & Shi, Weidong & Tian, Fei & Agarwal, Ramesh, 2021. "Effect of blade thickness on rotating stall of mixed-flow pump using entropy generation analysis," Energy, Elsevier, vol. 236(C).
    14. Lin, Tong & Zhu, Zuchao & Li, Xiaojun & Li, Jian & Lin, Yanpi, 2021. "Theoretical, experimental, and numerical methods to predict the best efficiency point of centrifugal pump as turbine," Renewable Energy, Elsevier, vol. 168(C), pages 31-44.
    15. Wang, Wenjie & Tai, Geyuan & Pei, Ji & Pavesi, Giorgio & Yuan, Shouqi, 2022. "Numerical investigation of the effect of the closure law of wicket gates on the transient characteristics of pump-turbine in pump mode," Renewable Energy, Elsevier, vol. 194(C), pages 719-733.
    16. Rossi, Mosè & Nigro, Alessandra & Renzi, Massimiliano, 2019. "Experimental and numerical assessment of a methodology for performance prediction of Pumps-as-Turbines (PaTs) operating in off-design conditions," Applied Energy, Elsevier, vol. 248(C), pages 555-566.
    17. Kan, Kan & Binama, Maxime & Chen, Huixiang & Zheng, Yuan & Zhou, Daqing & Su, Wentao & Muhirwa, Alexis, 2022. "Pump as turbine cavitation performance for both conventional and reverse operating modes: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
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