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Study on the Influence of Split Blades on the Force Characteristics and Fluid–Structure Coupling Characteristics of Pumps as Turbines

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  • Fengxia Shi

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
    Key Laboratory of Fluid Machinery and Systems of Gansu, Lanzhou 730050, China)

  • Xuexue Zong

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Guangbiao Zhao

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Denghui Zhang

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Pengcheng Wang

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

  • Haonan Zhan

    (School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

Abstract

In order to study the influence of split blades on the turbine force characteristics and fluid–structure coupling characteristics of pumps, this paper selected the IS 80-50-315 centrifugal pump, used as a reverse-acting hydraulic turbine, as the research object, optimized the original pump-acting turbine impeller, and adopted different combinations of long and short blades. Based on the SIMPLE algorithm and RNG k–ε turbulence model, a complete three-dimensional unsteady numerical simulation was conducted on the internal flow field of the pump-turbine. The results show that the split blades reduce the radial and axial forces. The deformation patterns of rotor components in the two pump types used as turbine models were similar, with deformation gradually decreasing from the inlet to the outlet of the impeller. The equivalent stress distribution law of the rotor components of the two pump turbine models has also been found to be similar, with the maximum stress occurring at the connection between the blades and the front and rear cover plates and the minimum stress occurring at the outlet area of the impeller and the maximum shaft diameter of the pump shaft. The maximum deformation and stress of the rotor components in the split blade impeller model were smaller than those in the original impeller model.

Suggested Citation

  • Fengxia Shi & Xuexue Zong & Guangbiao Zhao & Denghui Zhang & Pengcheng Wang & Haonan Zhan, 2025. "Study on the Influence of Split Blades on the Force Characteristics and Fluid–Structure Coupling Characteristics of Pumps as Turbines," Energies, MDPI, vol. 18(7), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:7:p:1642-:d:1619921
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    References listed on IDEAS

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    1. Haixia Yang & Qilian He & Xingxing Huang & Mengqi Yang & Huili Bi & Zhengwei Wang, 2022. "Experimental and Numerical Investigation of Rotor–Stator Interaction in a Large Prototype Pump–Turbine in Turbine Mode," Energies, MDPI, vol. 15(15), pages 1-24, July.
    2. Ephrem Yohannes Assefa & Asfafaw Haileselassie Tesfay, 2025. "Effect of Blade Number on Internal Flow and Performance Characteristics in Low-Head Cross-Flow Turbines," Energies, MDPI, vol. 18(2), pages 1-32, January.
    3. Jian-Cheng Cai & Hao-Jie Chen & Volodymyr Brazhenko & Yi-Hong Gu, 2021. "Study of the Hydrodynamic Unsteady Flow Inside a Centrifugal Fan and Its Downstream Pipe Using Detached Eddy Simulation," Sustainability, MDPI, vol. 13(9), pages 1-19, May.
    4. Barbarelli, S. & Amelio, M. & Florio, G., 2016. "Predictive model estimating the performances of centrifugal pumps used as turbines," Energy, Elsevier, vol. 107(C), pages 103-121.
    5. Friedrich-Karl Benra & Hans Josef Dohmen & Ji Pei & Sebastian Schuster & Bo Wan, 2011. "A Comparison of One-Way and Two-Way Coupling Methods for Numerical Analysis of Fluid-Structure Interactions," Journal of Applied Mathematics, Hindawi, vol. 2011, pages 1-16, November.
    6. Friedrich-Karl Benra & Hans Josef Dohmen & Ji Pei & Sebastian Schuster & Bo Wan, 2011. "A Comparison of One‐Way and Two‐Way Coupling Methods for Numerical Analysis of Fluid‐Structure Interactions," Journal of Applied Mathematics, John Wiley & Sons, vol. 2011(1).
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