Study On Internal Flow And Wear Of Turbine Guide Vane In Francis Turbine Of Multi-sediment High Head

When the flow components of the turbine are running on a river with high sediment content,due to the continuous collision and cutting of the sediment particles,serious wear and other problems will occur,which will cause the damage of the flow components,which will affect the safety and operation of the unit.Reliability has a huge impact.The damage to the movable guide vanes of turbines in high-head multi-sand hydropower stations is more serious,so it is very important to study the wear of the turbine guide vanes.The Xinjiang Xiate Hydropower Station studied in this paper is located in the middle reaches of the Kizilsu River in Xinjiang.It is the third cascade power station in the 2 reservoir6 level hydropower development plan for the Kizilsu River,and the station has a high sediment content and hardness.Larger.The main research work is as follows:1.According to the hydrology and sediment conditions of the high head and silt Xinjiang Xiaite Hydropower Station,the HLJF0904-LJ-302 francis turbine determined by the Xiate Hydropower Station under the given working conditions,three-dimensional water body modeling,grid division,boundary setting and numerical calculation of sand and water flow in some working conditions.2.Adopt the flow-through wear test method to carry out the sediment wear test on the movable guide vanes of the turbine under the design conditions.The sediment abrasion test piece and test device are designed according to the numerical calculation results of the sand and water flow inside the turbine of the Xiate Hydropower Station and the sediment abrasion test system.3.Test the wear of the surface of the test piece through the 3D morphology tester,obtain the wear depth data and the amount of wear,and determine the calculation formula of the wear rate of the selected wear-resistant material guide vane according to the numerical calculation and the results of the wear test,power supply station Prediction of wear of turbine runner vanes and other overcurrent components.The results of the study will be of great significance for the guide vane design and material selection of high-head hydropower stations on silt rivers.