| Yingxiuwan Hydropower station is located in the minjiang River,which is a mountainous river.When it encounters heavy rain,a large amount of sediment in the river will enter the generating water body,causing wear and damage to the turbine's flow components.This study focuses on the Yingxiuwan Hydropower Station,using the Eulerian(Eulerian)model in ANSYS CFX software and the solid-liquid two-phase flow model,with CFD numerical simulation.To simulate a certain particle diameter,with different particle concentration,the three-dimensional steady turbulent flow calculation of two-phase media under three different working conditions(small flow rate,set flow rate,and large flow rate)in full flow channel is carried out,analyze and study the movement condition(concentration and velocity)of each flowing component of the flow turbine and the wear condition of the flowing component such as the volute and guide vane,and designed two kinds of turbidity,three opening a total of 6 kinds of typical operation condition of guide vane specimen and form a complete set of test device,provideing necessary preparation conditions for the later study of sediment wear test.ts main contents and results are as follows:1.According to the physical objects of the turbine runner and the overlooks of the runner blade,with the help of the handheld 3D scanning instrument,the coordinates of the surface shape value points of the complex surface were obtained,which were then imported into UG software together with the volute,guide vane and tail pipe to establish the water body model of the turbine's overflows components.According to the established 3d full flow field geometric model of power station real machine,the professional meshing software ICEM is used to grid the full flow field geometric model of hydraulic turbine.2.Analyze the data of the overcurrent components of the real power plant to obtain the wear condition of the unit in actual operation.The data show that the turbine guide vane and runner have obvious sediment wear during the operation of the power station,and the most serious wear position is the fixed and movable guide vane and runner's head as well as the movable guide vane's tail.3.According to the sediment characteristics in the running river of Yingxiuwan Hydropower Station,the flow of sediment and water in the turbine is numerically calculated by USING CFX.Under the condition of certain particle diameter,particle concentration is different,and under different working conditions,the three-dimensional steady turbulent flowof two-phase medium full channel is calculated.CFD POST was used to post-process the calculation results,and the sediment volume concentration distribution and pressure distribution of each flow component under different conditions were obtained.Analysis of calculation results under various operating conditions,the numerical simulation results show that the stress distribution is symmetrical along the seat ring circumferential surface,inside the guide vane sediment concentration peak near the guide blade in the head,activity guide vane tail sediment rate is highest,which is expected to guide vane guide vane end wear serious head and activities,and with the increase of flow and sediment concentration,wear and tear.The numerical simulation result is more accurate because it matches with the actual wear of the power station.4.The guide vane specimen and sediment wear test device are designed,which provide necessary preparation for sediment wear test in the later stage. |
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