Hydraulic Modeltest And Numerical Simulation Of Discharge Structure Of Baliersi Hydrpower Station

Aiming at water Conservancy Project for Xinjiang Baliersi Hydropower Station,through studying on hydraulic characteristics of spillway and diversion tunnel,The parameters obtained from physical model test are used to verify the consistency of some laws of numerical simulation model and analysis the partial hydraulic characteristics of the physical model test can not be completed or difficult to complete due to the limitation of the conditions.Finally,the rationality and safety of the layout of drainage structures are obtained.The main results are as follows:1.The model design of spillway and diversion tunnel is reasonable.The discharge of spillway model is 37.82 m~3/s less than that of design calculation,about 4.60%less than that of check flood level 876.86 m test.It shows that the discharge capacity of spillway basically meets the design requirements.The discharge of diversion tunnel model is 67.03 m~3/s larger than that of design calculation,about 10.83%larger than that of check flood level 876.86 m test.It shows that the discharge capacity of diversion tunnel meets the design requirements.The discharge coefficients of the designed spillway flood level of 875.34 m and the checked flood level of 876.86 m calculated by the folded spillway width of 167.236 m at the front edge of the labyrinth weir are 0.261 and 0.220,respectively.The discharge coefficients calculated by the width of the front outlet of the labyrinth weir at 56.00m are 0.839 and 0.708,respectively.The design flood level of the diversion tunnel is 875.34m and the 876.86m flow coefficient of the check flood level is 0.797.2.The flow pattern of spillway diversion channel section,labyrinth weir control section,first-grade steep slope section,second-grade steep slope section and bucket-lifting section is good after optimization design,except that the height of side wall between0+021.600~0+024.000 section of first-grade equal width steep slope is insufficient.The height of the side walls of other sections meets the requirements of overflow.he flow pattern of intake,pressure tunnel in front of discharge tower and body of discharge tower of diversion spillway tunnel is good.The size of the tunnel section meets the requirement of overflow,and the side walls of open channel section and bucket section meet the requirement of overflow.3.There is no negative pressure appearing along the modified scheme.Most of the current cavitation is above 0.8,The minimum value is not less than 0.5,Therefore,the effect of water flow on the actual project cavitation during operation is negligible.Larger flow rate,the maximum flow rate is around 28m/s.It belongs to the category of high-speed flow,and need to control the construction unevenness,can not set aeration.4.The hydraulic characteristics of spillway are simulated by Fluent software.Numerical simulation results of hydraulic parameters such as water surface line,flow rate and pressure,the hydraulic parameters that can not be measured or difficult to measure in physical model are simulated and compared by numerical simulation.The feasibility of validated physical experiments and the accuracy of numerical simulation are illustrated.