| 1. |
- Baidar, Binaya, et al.
(författare)
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Selection of Optimal Number of Francis Runner Blades for a Sediment Laden Micro Hydropower Plant in Nepal
- 2015
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Ingår i: The International Journal of Fluid Machinery and Systems. - : Korean Fluid Machinery Association. - 1882-9554. ; 8:4, s. 294-303
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Tidskriftsartikel (refereegranskat)abstract
- The present study is conducted to identify a better design and optimal number of Francis runner blades for sediment laden high head micro hydropower site, Tara Khola in the Baglung district of Nepal. The runner is designed with in-house code and Computational Fluid Dynamics (CFD) analysis is performed to evaluate the performance with three configurations; 11, 13 and 17 numbers of runner blades. The three sets of runners were also investigated for the sediment erosion tendency. The runner with 13 blades shows better performance at design as well as in variable discharge conditions. 96.2% efficiency is obtained from the runner with 13 blades at the design point, and the runners with 17 and 11 blades have 88.25% and 76.63% efficiencies respectively. Further, the runner with 13 blades has better manufacturability than the runner with 17 blades as it has long and highly curved blade with small gaps between the blades, but it comes with 65% more erosion tendency than in the runner with 17 blades.
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| 2. |
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| 3. |
- Neopane, Hari Prasad, et al.
(författare)
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Sediment erosion in hydraulic turbines
- 2011
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Ingår i: Global Journal of Research Engineering. - 0975-5861. ; 11:6
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Tidskriftsartikel (refereegranskat)abstract
- Sediment erosion not only reduces efficiency and life of hydropower turbines but also causes problems in operation and maintenance. Several factors are responsible for this erosion in hydro turbine components. This paper presents the sediment erosion types in hydraulic turbines and their components based upon an extensive literature review and the field observation at Cahua hydropower plant, Peru. It includes some recommended methods to minimize the effect of sediment erosion in the turbine components. An alternative design of a Francis turbine in sediment-laden water is also briefly discussed.
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| 4. |
- Neopane, Hari Prasad, et al.
(författare)
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The effect of sediment characteristics for predicting erosion on Francis turbines blades
- 2012
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Ingår i: International journal on hydropower and dams. - 1352-2523. ; 19:1, s. 79-83
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Tidskriftsartikel (refereegranskat)abstract
- Sediment erosion not only reduces efficiency and life of hydropower turbines but also causes problems in operation and maintenance. Several factors are responsible for this erosion in hydro turbine components. Numerical simulations of a prototype Francis turbine are carried out to investigate the influence of sediment characteristics on erosion prediction. Results from prototype inspection allow a qualitative validation of the simulations. The numerical predictions of erosion are based on Lagrangian calculation of particle paths in a turbulent viscous flow. The relationships between sediment movement and erosion inside the turbine are investigated. It is found that the erosion process is strongly dependent on the particle size, shape, and concentration. Furthermore, the variation of relative erosion rate density is different for different guide vane openings. The results may be used for sediment erosion prediction and prevention.
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