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Design and verification of Francis turbine working in sand laden hydro-power plant

Author

Listed:
  • Yang, Jing
  • Peng, Chong
  • Li, Changquan
  • Liu, Xinjun
  • Liu, Jian
  • Wang, Zhengwei

Abstract

Sand erosion is usually severe for hydraulic turbine operated in sediment-laden river hydro-power plant. Continuous erosion and abrasion in hydro-turbine components not only deteriorate the turbine performance but also bring frequent maintenance work. Thus, special attentions should be paid to anti-erosion performance besides the efficiency and stability during the hydraulic design stage. In this paper, the performances of a prototype Francis turbine used for a high head heavy sediment power station were investigated by reducing the rotational speed and using splitter runner. The hydraulic performance, anti-erosion characteristics and cavitation performance were focused and analyzed. The results proved that the velocity in the runner can be effectively reduced by lower the rotational speed, but the rotational speed reduction was also limited by the efficiency and velocity near the guide vane. The splitter runner can significantly improve the disorder flow in runner by re-distributing the velocity field. The erosion resistance of guide vane can be improved by increasing the pitch diameter of the guide vane appropriately. 3100 h of operation after commissioning further confirmed the anti-erosion and stability performance of the designed Francis turbine. This research provide a good reference for the Francis turbine design operated in heavy sediment hydro-power plant.

Suggested Citation

  • Yang, Jing & Peng, Chong & Li, Changquan & Liu, Xinjun & Liu, Jian & Wang, Zhengwei, 2023. "Design and verification of Francis turbine working in sand laden hydro-power plant," Renewable Energy, Elsevier, vol. 207(C), pages 40-46.
    • Handle: RePEc:eee:renene:v:207:y:2023:i:c:p:40-46
    DOI: 10.1016/j.renene.2023.02.088
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    References listed on IDEAS

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    1. Thapa, Biraj Singh & Dahlhaug, Ole Gunnar & Thapa, Bhola, 2017. "Sediment erosion induced leakage flow from guide vane clearance gap in a low specific speed Francis turbine," Renewable Energy, Elsevier, vol. 107(C), pages 253-261.
    2. Khanal, Krishna & Neopane, Hari P. & Rai, Shikhar & Thapa, Manoj & Bhatt, Subendu & Shrestha, Rajendra, 2016. "A methodology for designing Francis runner blade to find minimum sediment erosion using CFD," Renewable Energy, Elsevier, vol. 87(P1), pages 307-316.
    3. Aponte, R.D. & Teran, L.A. & Grande, J.F. & Coronado, J.J. & Ladino, J.A. & Larrahondo, F.J. & Rodríguez, S.A., 2020. "Minimizing erosive wear through a CFD multi-objective optimization methodology for different operating points of a Francis turbine," Renewable Energy, Elsevier, vol. 145(C), pages 2217-2232.
    4. Koirala, Ravi & Thapa, Bhola & Neopane, Hari Prasad & Zhu, Baoshan, 2017. "A review on flow and sediment erosion in guide vanes of Francis turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 75(C), pages 1054-1065.
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