Pumped storage power stations on sediment-laden rivers are highly susceptible to erosion damage on the surfaces of major flow-passingcomponents due to sediment particles.In this study,an Euler-Lagrange model is employ...Pumped storage power stations on sediment-laden rivers are highly susceptible to erosion damage on the surfaces of major flow-passingcomponents due to sediment particles.In this study,an Euler-Lagrange model is employed to numerically investigate the sand-water flowcharacteristics and erosion prediction of a pump-turbine under hump-region conditions,focusing on crest,trough,and high-flow operatingpoints.The results show that the internal flow of the pump-turbine undergoes significant changes in the hump region.Under low-flowconditions,flow separation,backflow,and local vortex phenomena occur inside the runner.Vortices in the runner passages tend to entrainsediment particles,resulting in a reduction in particle velocity.With increasing sand-water flow rate,a pronounced velocity difference developson both sides of the blades,with the maximum difference reaching 20 m/s.The average erosion rates on the runner blades and the endfaces of the guide vanes are 4.2×10^(-8) and 3.5×10^(-8) kg/(s·m^(2)),respectively.The cutting erosion patterns on the blade surfaces coincide withthe trajectories of the water flow vortices,and the erosion rate distribution on the guide vane end faces shows a high degree of consistencywith the distribution of sand-water vortices.展开更多
文摘Pumped storage power stations on sediment-laden rivers are highly susceptible to erosion damage on the surfaces of major flow-passingcomponents due to sediment particles.In this study,an Euler-Lagrange model is employed to numerically investigate the sand-water flowcharacteristics and erosion prediction of a pump-turbine under hump-region conditions,focusing on crest,trough,and high-flow operatingpoints.The results show that the internal flow of the pump-turbine undergoes significant changes in the hump region.Under low-flowconditions,flow separation,backflow,and local vortex phenomena occur inside the runner.Vortices in the runner passages tend to entrainsediment particles,resulting in a reduction in particle velocity.With increasing sand-water flow rate,a pronounced velocity difference developson both sides of the blades,with the maximum difference reaching 20 m/s.The average erosion rates on the runner blades and the endfaces of the guide vanes are 4.2×10^(-8) and 3.5×10^(-8) kg/(s·m^(2)),respectively.The cutting erosion patterns on the blade surfaces coincide withthe trajectories of the water flow vortices,and the erosion rate distribution on the guide vane end faces shows a high degree of consistencywith the distribution of sand-water vortices.
