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Selection of guide vane profile for erosion handling in Francis turbines

Author

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  • Koirala, Ravi
  • Neopane, Hari Prasad
  • Shrestha, Oblique
  • Zhu, Baoshan
  • Thapa, Bhola

Abstract

In guide vane cascade of Francis turbine, highest acceleration occurs, which generates equivalent amount of force for work done and erosion due to instantaneous change in flow dynamics. Hence in addition to runner vane, suitable selection of guide vane profile has equal importance. Usually, NACA defined hydrofoils are used for guide vanes. Numerous options are available, but selection of best one for optimum energy harness is important. Primarily, guide vane torque and turbine efficiency is prioritized. For the turbines operating in sediment laden water, pressure difference between two sides of guide vane and erosion resistivity are additional factors to be considered. This work was performed in the vicinity of guide vane profile selection for Francis turbines operating in sediment laden water. Computational analysis on turbine flow passage and experimental study with Rotating Disc Apparatus were performed in order to identify suitable profile. Unsymmetrical profiles were found to be better handling erosion maintaining consistency in turbine performance.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:112:y:2017:i:c:p:328-336
    DOI: 10.1016/j.renene.2017.05.033
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    References listed on IDEAS

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    1. Ravi Koirala & Baoshan Zhu & Hari Prasad Neopane, 2016. "Effect of Guide Vane Clearance Gap on Francis Turbine Performance," Energies, MDPI, vol. 9(4), pages 1-14, April.
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    Cited by:

    1. Jing Dong & Zhongdong Qian & Biraj Singh Thapa & Bhola Thapa & Zhiwei Guo, 2019. "Alternative Design of Double-Suction Centrifugal Pump to Reduce the Effects of Silt Erosion," Energies, MDPI, vol. 12(1), pages 1-22, January.
    2. Gabl, Roman & Innerhofer, Daniel & Achleitner, Stefan & Righetti, Maurizio & Aufleger, Markus, 2018. "Evaluation criteria for velocity distributions in front of bulb hydro turbines," Renewable Energy, Elsevier, vol. 121(C), pages 745-756.
    3. Adnan Aslam Noon & Man-Hoe Kim, 2021. "Sediment and Cavitation Erosion in Francis Turbines—Review of Latest Experimental and Numerical Techniques," Energies, MDPI, vol. 14(6), pages 1-19, March.

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