Study On Internal Flow And Wear Of Turbine Guide Vane In High-head Hydropower Station With Sediment-laden

It is well known that in the multi-sediment high water head hydropower station,the turbine guide vanes are the most severe over-flow component of the over-flow component of the turbine.The area of the river where the Xiate Hydropower Station is located in Xinjiang has a high sediment content and the hardness of the sand grains is large.Based on the experience of other multi-sediment high water head hydropower stations,it is expected that the turbine guide vanes wear of the Xiate hydropower station will also be quite serious.In this study,the water flow characteristics and sediment concentration distribution of the guide vanes of HLA542-LJ-275 turbine are analyzed by numerical simulation for Xiate Hydropower Station.It could provide an important reference for the turbine design of Xiate Hydropower Station.The main research results are as follows:In this study,three-dimensional geometric modeling of the whole flow passage of HLA 542-LJ-275 turbine for Chart Hydropower Station is carried out by using UG,a three-dimensional modeling software.Moreover,each passing component is introduced into ICEM CFD software for grid division and grid independence is verified.Three working conditions(small flow conditions,design conditions and large flow conditions)were simulated by using fluid dynamics software,and the characteristics of sand flow and sediment concentration were obtained.The numerical results show that the pressure distribution is symmetrical along the circular surface,and the maximum sediment concentration in the guide vanes appears near the head of guide vanes,and the sediment velocity on the back of the guide vanes near the tail area are the highest,thus estimating the guide vanes head and the tail wear of the guide vanes will be serious.Sediment wear test was carried out on the guide vanes of HLA542-LJ-275 turbine selected for Shatt Hydropower Station by surface morphology method.The wear amount of the guide vanes at the key position were analyzed,and the wear amount near the tail of the guide vanes were found to be large.Compared with the numerical results,it is found that the degree of abrasion of the guide vanes of hydraulic turbine are affected by sediment speed and sediment concentration,mainly by the speed of sand and water,and the high wear of the tail velocity of the guide vanes are the most serious.It could provide an important reference for the design of anti-sediment wear and tear of water turbine in Xiate Hydropower Station.