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Research on Groove Method to Suppress Stall in Pump Turbine

Author

Listed:
  • Yong Liu

    (School of Mechanical Engineering, Shanghai Jiao Tong University, Minhang, Shanghai 200240, China)

  • Hongjuan Ran

    (School of Mechanical Engineering, Shanghai Jiao Tong University, Minhang, Shanghai 200240, China)

  • Dezhong Wang

    (School of Mechanical Engineering, Shanghai Jiao Tong University, Minhang, Shanghai 200240, China)

Abstract

The pump turbine is prone to stall when running at part-load operation. Stalls would cause a hump-like head characteristic curve, low-frequency high-amplitude pressure pulsation, and surge or resonance in the system. There is a lack of efficient methods for pump turbine stall suppression. The traditional blade hydrodynamic optimization method has limited effect and would influence the other characteristics. As the essence of stall is flow separation, forming a severe backflow vortex, a “Groove Method” is put forward and employed to suppress stall in a pump turbine with the full consideration of the mechanical structure, flow field, and pressure field. Both experiments and calculations are carried out to test the effectiveness of this new method. Furthermore, its deep mechanisms are revealed. This method can weaken the head hump to a certain extent and reduce the pressure pulse amplitude induced by stall. Meanwhile, the performance at the design operating point is not disturbed much.

Suggested Citation

  • Yong Liu & Hongjuan Ran & Dezhong Wang, 2020. "Research on Groove Method to Suppress Stall in Pump Turbine," Energies, MDPI, vol. 13(15), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:3822-:d:389683
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    References listed on IDEAS

    as
    1. Liu, Yabin & Tan, Lei, 2018. "Method of C groove on vortex suppression and energy performance improvement for a NACA0009 hydrofoil with tip clearance in tidal energy," Energy, Elsevier, vol. 155(C), pages 448-461.
    2. Liu, Yabin & Tan, Lei, 2020. "Method of T shape tip on energy improvement of a hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 149(C), pages 42-54.
    3. Liu, Yabin & Tan, Lei, 2020. "Influence of C groove on suppressing vortex and cavitation for a NACA0009 hydrofoil with tip clearance in tidal energy," Renewable Energy, Elsevier, vol. 148(C), pages 907-922.
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    Cited by:

    1. Yonglin Qin & Deyou Li & Hongjie Wang & Xianzhu Wei, 2023. "Optimization of Setting Angle Distribution to Suppress Hump Characteristic in Pump Turbine," Energies, MDPI, vol. 16(5), pages 1-18, March.
    2. Qin, Yonglin & Li, Deyou & Wang, Hongjie & Liu, Zhansheng & Wei, Xianzhu & Wang, Xiaohang & Yang, Weibin, 2023. "Comprehensive hydraulic performance improvement in a pump-turbine: An experimental investigation," Energy, Elsevier, vol. 284(C).

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