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Effect of Guide Vane Clearance Gap on Francis Turbine Performance

Author

Listed:
  • Ravi Koirala

    () (State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
    Turbine Testing Lab, Kathmandu University, P.O. Box 6250, Dhulikhel, Nepal)

  • Baoshan Zhu

    () (State Key Laboratory of Hydroscience and Engineering, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China)

  • Hari Prasad Neopane

    () (Turbine Testing Lab, Kathmandu University, P.O. Box 6250, Dhulikhel, Nepal)

Abstract

Francis turbine guide vanes have pivoted support with external control mechanism, for conversion of pressure to kinetic energy and to direct them to runner vanes. This movement along the support is dependent on variation of load and flow (operating conditions). Small clearance gaps between facing plates and the upper and lower guide vane tips are available to aid this movement, through which leakage flow occurs. This secondary flow disturbs the main flow stream, resulting performance loss. Additionally, these increased horseshoe vortex, in presence of sand, when crosses through the gaps, both the surfaces are eroded. This causes further serious effect on performance and structural property by increasing gaps. This paper discusses the observation of the severity in hydropower plants and effect of clearance gaps on general performance of the Francis turbine through computational methods. It also relates the primary result with the empirical relation for leakage flow prediction. Additionally, a possible method to computationally estimate thickness depletion has also been presented. With increasing clearance gap, leakage increases, which lowers energy conversion and turbine efficiency along with larger secondary vortex.

Suggested Citation

  • Ravi Koirala & Baoshan Zhu & Hari Prasad Neopane, 2016. "Effect of Guide Vane Clearance Gap on Francis Turbine Performance," Energies, MDPI, Open Access Journal, vol. 9(4), pages 1-1, April.
  • Handle: RePEc:gam:jeners:v:9:y:2016:i:4:p:275-:d:67971
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    References listed on IDEAS

    as
    1. Thapa, Biraj Singh & Thapa, Bhola & Dahlhaug, Ole Gunnar, 2012. "Current research in hydraulic turbines for handling sediments," Energy, Elsevier, vol. 47(1), pages 62-69.
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    Citations

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    Cited by:

    1. Koirala, Ravi & Neopane, Hari Prasad & Shrestha, Oblique & Zhu, Baoshan & Thapa, Bhola, 2017. "Selection of guide vane profile for erosion handling in Francis turbines," Renewable Energy, Elsevier, vol. 112(C), pages 328-336.
    2. 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.
    3. Daqing Zhou & Huixiang Chen & Jie Zhang & Shengwen Jiang & Jia Gui & Chunxia Yang & An Yu, 2019. "Numerical Study on Flow Characteristics in a Francis Turbine during Load Rejection," Energies, MDPI, Open Access Journal, vol. 12(4), pages 1-1, February.
    4. Yabin Liu & Lei Tan & Binbin Wang, 2018. "A Review of Tip Clearance in Propeller, Pump and Turbine," Energies, MDPI, Open Access Journal, vol. 11(9), pages 1-1, August.
    5. Koirala, Ravi & Neopane, Hari Prasad & Zhu, Baoshan & Thapa, Bhola, 2019. "Effect of sediment erosion on flow around guide vanes of Francis turbine," Renewable Energy, Elsevier, vol. 136(C), pages 1022-1027.
    6. 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.

    More about this item

    Keywords

    guide vanes; sediment erosion; clearance gap; performance; leakage flow;

    JEL classification:

    • Q - Agricultural and Natural Resource Economics; Environmental and Ecological Economics
    • Q0 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - General
    • Q4 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy
    • Q40 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - General
    • Q41 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Demand and Supply; Prices
    • Q42 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Alternative Energy Sources
    • Q43 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy and the Macroeconomy
    • Q47 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Energy Forecasting
    • Q48 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Government Policy
    • Q49 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Energy - - - Other

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