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Improving the cavitation inception performance of a reversible pump-turbine in pump mode by blade profile redesign: Design concept, method and applications

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  • Tao, Ran
  • Xiao, Ruofu
  • Wang, Fujun
  • Liu, Weichao

Abstract

In reversible pump-turbines at pump mode, local flow separation on the leading-edge overlaps the impeller's low-pressure side and causes a sudden pressure-drop. Hence, cavitation easily incepts on leading-edge especially at off-design conditions. To solve this cavitation problem, a NACA0006 profile was used as a simplified model of pump-turbine impeller blade to understand the cavitation inception mechanism. Numerical results indicate multiple favorable-pressure-gradients, which were caused by the quickly-varied geometry, on the hydrofoil surface. The minimum pressure occurs in one of these gradients' region and usually locates around leading-edge because of the quickly-varied geometry of leading-edge arc. Then, Diffusion-angle Integral design method was developed to design the blade leading-edge shape. It has only three design parameters by effective geometry deconstruction. Based on orthogonal test, the reasonable values of design parameters can be determined. With optimal design parameters, the NACA0006 foil and pump-turbine impeller blade were completely redesigned and improved. The inception cavitation number of the redesigned foil was obviously reduced especially at large incidence angles. The redesigned pump-turbine also has a reduced inception cavitation number and delayed cavitation inception especially at off-design conditions. The design concept, method and application in this study provide useful reference for anti-inception-cavitation design of turbomachinery blades.

Suggested Citation

  • Tao, Ran & Xiao, Ruofu & Wang, Fujun & Liu, Weichao, 2019. "Improving the cavitation inception performance of a reversible pump-turbine in pump mode by blade profile redesign: Design concept, method and applications," Renewable Energy, Elsevier, vol. 133(C), pages 325-342.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:325-342
    DOI: 10.1016/j.renene.2018.09.108
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    References listed on IDEAS

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    1. Tao, Ran & Xiao, Ruofu & Wang, Fujun & Liu, Weichao, 2018. "Cavitation behavior study in the pump mode of a reversible pump-turbine," Renewable Energy, Elsevier, vol. 125(C), pages 655-667.
    2. Zhang, Yuning & Zhang, Yuning & Qian, Zhongdong & Ji, Bin & Wu, Yulin, 2016. "A review of microscopic interactions between cavitation bubbles and particles in silt-laden flow," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 303-318.
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    2. Li, Deyou & Song, Yechen & Lin, Song & Wang, Hongjie & Qin, Yonglin & Wei, Xianzhu, 2021. "Effect mechanism of cavitation on the hump characteristic of a pump-turbine," Renewable Energy, Elsevier, vol. 167(C), pages 369-383.
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    5. Hu, Jinhong & Yang, Jiebin & He, Xianghui & Zeng, Wei & Zhao, Zhigao & Yang, Jiandong, 2023. "Transition of amplitude–frequency characteristic in rotor–stator interaction of a pump-turbine with splitter blades," Renewable Energy, Elsevier, vol. 205(C), pages 663-677.
    6. Trivedi, Chirag & Iliev, Igor & Dahlhaug, Ole Gunnar & Markov, Zoran & Engstrom, Fredrik & Lysaker, Henning, 2020. "Investigation of a Francis turbine during speed variation: Inception of cavitation," Renewable Energy, Elsevier, vol. 166(C), pages 147-162.
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    11. Zhang, Wenwu & Xie, Xing & Zhu, Baoshan & Ma, Zhe, 2021. "Analysis of phase interaction and gas holdup in a multistage multiphase rotodynamic pump based on a modified Euler two-fluid model," Renewable Energy, Elsevier, vol. 164(C), pages 1496-1507.
    12. Li, Xiao-Bin & Binama, Maxime & Su, Wen-Tao & Cai, Wei-Hua & Muhirwa, Alexis & Li, Biao & Li, Feng-Chen, 2020. "Runner blade number influencing RPT runner flow characteristics under off-design conditions," Renewable Energy, Elsevier, vol. 152(C), pages 876-891.
    13. Zhu, Di & Tao, Ran & Xiao, Ruofu & Pan, Litan, 2020. "Solving the runner blade crack problem for a Francis hydro-turbine operating under condition-complexity," Renewable Energy, Elsevier, vol. 149(C), pages 298-320.
    14. 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).
    15. Binama, Maxime & Su, Wen-Tao & Cai, Wei-Hua & Li, Xiao-Bin & Muhirwa, Alexis & Li, Biao & Bisengimana, Emmanuel, 2019. "Blade trailing edge position influencing pump as turbine (PAT) pressure field under part-load conditions," Renewable Energy, Elsevier, vol. 136(C), pages 33-47.
    16. Hong, Sheng & Wu, Yuping & Wu, Jianhua & Zhang, Yuquan & Zheng, Yuan & Li, Jiahui & Lin, Jinran, 2021. "Microstructure and cavitation erosion behavior of HVOF sprayed ceramic-metal composite coatings for application in hydro-turbines," Renewable Energy, Elsevier, vol. 164(C), pages 1089-1099.
    17. Di Zhu & Ruofu Xiao & Ran Tao & Fujun Wang, 2018. "Designing Incidence-Angle-Targeted Anti-Cavitation Foil Profiles Using a Combination Optimization Strategy," Energies, MDPI, vol. 11(11), pages 1-15, November.
    18. Zhu, Di & Xiao, Ruofu & Liu, Weichao, 2021. "Influence of leading-edge cavitation on impeller blade axial force in the pump mode of reversible pump-turbine," Renewable Energy, Elsevier, vol. 163(C), pages 939-949.

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