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Effect of sediment erosion on flow around guide vanes of Francis turbine

Author

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

Abstract

Sediment erosion in guide vane of Francis turbine has been a crucial issue for turbines operating in Himalayas. Large sediment load with higher percentage of Quartz in Himalayan river causes erosion on GV faces, leaf, stem, leading and trailing edges and at clearance gaps (both facing plate and GV edges). This in turn increases profile roughness and clearance gaps height, causing higher friction losses and cross flow across the vanes, which ultimately affects inlet flow dynamics. Research attempts are limited to computational analysis and prediction of erosion losses. The effect of erosion on flow passing vanes is a crucial issue yet to be explored. This work focuses on experimental prediction of effect of erosion in 3 GV cascade system. The cascade geometry was developed with CFD based iterative method, maintaining flow similarity around GV in turbine and cascade. It has been found that the pressure on two sides of vane and at vane outlet increases with erosion for considered extent erosion.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:136:y:2019:i:c:p:1022-1027
    DOI: 10.1016/j.renene.2019.01.045
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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.
    2. Thapa, Biraj Singh & Thapa, Bhola & Dahlhaug, Ole G., 2012. "Empirical modelling of sediment erosion in Francis turbines," Energy, Elsevier, vol. 41(1), pages 386-391.
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    Citations

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    Cited by:

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    2. Megavath Vijay Kumar & T. Subba Reddy & P. Sarala & P. Srinivasa Varma & Obbu Chandra Sekhar & Abdulrahman Babqi & Yasser Alharbi & Basem Alamri & Ch. Rami Reddy, 2022. "Experimental Investigation and Performance Characteristics of Francis Turbine with Different Guide Vane Openings in Hydro Distributed Generation Power Plants," Energies, MDPI, vol. 15(18), pages 1-24, September.
    3. Guo, Bao & Xiao, Yexiang & Rai, Anant Kumar & Liang, Quanwei & Liu, Jie, 2021. "Analysis of the air-water-sediment flow behavior in Pelton buckets using a Eulerian-Lagrangian approach," Energy, Elsevier, vol. 218(C).
    4. Lu, Zhaoheng & Tao, Ran & Yao, Zhifeng & Liu, Weichao & Xiao, Ruofu, 2022. "Effects of guide vane shape on the performances of pump-turbine: A comparative study in energy storage and power generation," Renewable Energy, Elsevier, vol. 197(C), pages 268-287.
    5. Hong, Sheng & Wu, Yuping & Wu, Jianhua & Zhang, Yuquan & Zheng, Yuan & Li, Jiahui & Lin, Jinran, 2021. "Microstructure and cavitation erosion behavior of HVOF sprayed ceramic-metal composite coatings for application in hydro-turbines," Renewable Energy, Elsevier, vol. 164(C), pages 1089-1099.

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