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Comprehensive Hydraulic Improvement and Parametric Analysis of a Francis Turbine Runner

Author

Listed:
  • Zhe Ma

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Baoshan Zhu

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Cong Rao

    (Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China)

  • Yonghong Shangguan

    (Hunan Vanguard Group Co. Ltd., Changsha 100761, China)

Abstract

Hydraulic turbines are usually required to operate in a wide range. The operation at off-design conditions not only reduces the unit efficiency, but also significantly deteriorates the dynamic stability of the turbines. In order to develop a turbine runner with good performances under multi operation conditions, a comprehensive hydraulic improvement has been done of a Francis turbine runner with a multipoint and multi-objective optimization design system. Compared with the initial runner, the runner generated from this method has a satisfactory improvement. In detail, unit efficiencies of the preferred runner are increased by 0.91%, 0.47% and 0.37%, respectively, under the rated head, a high head and the maximum head. The lowest pressure at blade surface is improved by 376.2 kPa under the rated head. CFD calculations are conducted to analyze the flow conditions inside of the preferred runner. In addition, runners with different main design inputs, namely blade lean, blade loading and blade meridional shape are furtherly investigated to reveal their relationship with runner’s internal flow and outer performances. In summary, this optimization system supplies satisfactory results and convincing recommendations to determine the design inputs for low-head Francis turbine runners.

Suggested Citation

  • Zhe Ma & Baoshan Zhu & Cong Rao & Yonghong Shangguan, 2019. "Comprehensive Hydraulic Improvement and Parametric Analysis of a Francis Turbine Runner," Energies, MDPI, vol. 12(2), pages 1-20, January.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:2:p:307-:d:199143
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    References listed on IDEAS

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    Cited by:

    1. Wei Yang & Benqing Liu & Ruofu Xiao, 2019. "Three-Dimensional Inverse Design Method for Hydraulic Machinery," Energies, MDPI, vol. 12(17), pages 1-19, August.
    2. 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.
    3. Yun Jia & Xianzhu Wei & Qianyun Wang & Jinsheng Cui & Fengchen Li, 2019. "Experimental Study of the Effect of Splitter Blades on the Performance Characteristics of Francis Turbines," Energies, MDPI, vol. 12(9), pages 1-16, May.
    4. Zhou, Xing & Shi, Changzheng & Miyagawa, Kazuyoshi & Wu, Hegao, 2021. "Effect of modified draft tube with inclined conical diffuser on flow instabilities in Francis turbine," Renewable Energy, Elsevier, vol. 172(C), pages 606-617.
    5. Maria Cristina Morani & Mariana Simão & Ignac Gazur & Rui S. Santos & Armando Carravetta & Oreste Fecarotta & Helena M. Ramos, 2022. "Pressure Drop and Energy Recovery with a New Centrifugal Micro-Turbine: Fundamentals and Application in a Real WDN," Energies, MDPI, vol. 15(4), pages 1-25, February.
    6. Qin, Yonglin & Li, Deyou & Wang, Hongjie & Liu, Zhansheng & Wei, Xianzhu & Wang, Xiaohang, 2022. "Multi-objective optimization design on high pressure side of a pump-turbine runner with high efficiency," Renewable Energy, Elsevier, vol. 190(C), pages 103-120.

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