Study On Hydraulic Characteristics Model Test And Numerical Simulation Of Drainage Buildig In Qingyuan Hydropower Station

Underflow energy dissipation is to make the drainage of water flow in drainage buildings export producc hydraulic jump within certain limits,by hydraulic jump to bridge upstream and downstream water flow,and through the surface of the hydraulic jump produce spiral roll and strong turbulcnce to achieve the purpose of energy dissipation,because small atomization,strong adaptability of the topography,is widely used in the flood discharge energy dissipation facilities.But the bottom of the lower the Froude number of flow energy dissipation,easier to produce corrugated water jump,low dissipation,so lower the froude number at the bottom of the drain structure optimization of flow energy dissipation is key to safe water,efficient energy dissipation.Liaoning qingyuan pumped storage power station,the author of this paper,through the hydraulic model test of spillway and the flow,pressure,flow rate of the tunnel,the hydraulic characteristies are analyzed and optimize the design scheme,finally verified with numerical simulation and physical model.The main results are as follows:(1)The design of spillway and spillway tunnel is reasonable,and the flow rate of spillway and spillway tunnel model is greater than the calculated flow rate.The flow coefficient of the flood water level of the spillway was 0,461,the flood water level was 319.00m and the flood water level of the school was 0.90;(2)The approach channel for the spillway section,control and steep slope in the discharge flow regime is good,the modified scheme of the stilling basin size basic can satisfy the requirement of energy dissipation of hydraulic jump,modify the plan which is set on the apron of the baffle pier can satisfy the requirement of energy dissipation and scouring downstream of the lighter;(3)The original scheme spillway tunnel inlet and tunnel flow state are all good.Modification plan and section size of hole meet the flow requirements,hole body and a steep slope section parabola cohesion reasonable design,basic can satisfy the requirement of energy dissipation of hydraulic jump stilling basin size,modification scheme which is set on the apron of the baffle pier can seatisfy the requirement of energy dissipation,the downstream scouring is lighter;(4)There is no negative pressure on the edge of the modification plan,the number of flow cavitation is small,and the flow velocity is large,so the construction irregularity needs to be controlled.The pulsating pressure advantage frequency of spillway and spillway is less than 1Hz,which belongs to low frequency category and has little effect on buildings;(5)In the design of flood water level,numerical simulation of spillway hydraulic characteristics was carried out using FLUENT software.The results show that the water depth,pressure,velocity and other hydraulic characteristics are in good agreement with the test results,indicating that the numerical model is feasible in practical application.