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Publications (11)
In this study, a numerical investigation has been performed to extract and compare the hydrodynamic damping of a non-rotating system of eight planar hydrofoils, arranged in a radial configuration, with the related wake behaviour downstream the structure. A modal acoustic analysis has been performed on the structure in order to extract the global mo...
In Nepal and the regions along with the Andes, sediment erosion is one of the major causes of the failure of hydro turbines. Every year lots of the components of turbines exposed to sediment-laden water got eroded resulting unexpected shutdown of the power plants. The cheapest method of repairing these eroded runners and other components of turbine...
![Figure 4. Mesh Independence Test [4]](profile/Dadi-Dahal/publication/361219566/figure/fig1/AS:11431281105520378@1670438097975/Mesh-Independence-Test-4_Q320.jpg)
![Figure 5. Computational Domain of Francis Turbine model [4]](profile/Dadi-Dahal/publication/361219566/figure/fig2/AS:11431281105510901@1670438098008/Computational-Domain-of-Francis-Turbine-model-4_Q320.jpg)
Cavitation is one of the major challenges in the Himalayan rivers of Nepal that cause damage and degradation of the performance of hydraulic turbine components. Numerical analysis has been performed to investigate the cavitation effect in the Francis turbine. For detection of cavitation, the SST turbulence model using Rayleigh plesset equation has...
The manufacturing of micro-hydro turbines, especially Cross-Flow, Pelton, Propeller turbine, has been carried for more than 50 years in Nepal. A prominent opportunity in the manufacturing of Francis turbines has been perceived in recent years as the requirements of turbines for future installations falls on the Francis turbine range and are above 6...
Francis turbine is the most widely used type of hydro turbine due to its high efficiency and a wide range of operation. Despite its popularity in large scale power plants, the use of these turbines has not been yet realized for micro hydro applications. Considering the sustainability of micro-hydro power plants, the components of Francis turbine ne...
This study presents a Francis turbine designed for micro hydro application, using bovet approach of design and other general techniques, with some variations which make the manufacturing procedure relatively simpler. It also depicts the status of micro hydro in Nepal. Simplifications has been administered on runner, vane cascade and spiral casing....
Uncertainty is a parameter associated with the result of a measurement, which characterizes the dispersion of the values that could reasonably be attributed to the measurand. All measurements are subject to uncertainty and a measurement result is complete only when it is accompanied by a statement of the associated uncertainty, such as standard dev...
In Nepal, sediment erosion is a major cause of hydro-turbine failure. Every year turbine parts expose to water got eroded and failed ultimately resulting in loss of efficiency as well as increase in the repair cost. For repair of these eroded surfaces welding is quit famous in Nepal due to low cost to build up the eroded surface however specific we...
Spiral casing is an important component of Francis turbine for even distribution of kinetic and potential energy of water so as to achieve the required reaction for better performance of the runner. Optimal design and analysis of spiral configuration is challenging, especially when the turbine is operating in a low head range due to the necessity o...
![Figure 1. Turbine application range chart of different turbine types [15]](publication/334901089/figure/fig1/AS:787614827298816@1564793416183/Turbine-application-range-chart-of-different-turbine-types-15_Q320.jpg)
![Figure 3. 92kW Francis turbine designed and manufactured in Nepal[30]](publication/334901089/figure/fig2/AS:787614827294720@1564793416262/kW-Francis-turbine-designed-and-manufactured-in-Nepal30_Q320.jpg)
Despite the initiation of the master plan, envisioned by the government of Nepal, complete electrification of rural Nepal still seems over ambitious for quite a long time. Thus Micro Hydropower Plants (MHP) can still be very effective for rural electrification. Decades of manufacturing of same type turbines have saturated the turbine manufacturing...
Francis turbine are ideal turbines for Himalayan and Andes region where both low and high-altitude mountains are located. Turbines operating in such regions face operational and maintenance problems due to the sediment erosion. In order to reduce the erosion effects on these components the design of components for higher sediment handling is essenc...
