Research On Optimization Of Body Shape Of Kongliang Reservoir

In recent years,the spillway has not only been an important part of the safe operation of the reservoir and flood discharge,but also the focus of scientific research.Among them,the high-water head spillway has become a key technical issue in the project due to large drop,narrow river valley,large single-wide flow and other reasons,such as high-speed water flow,hydraulic design and flood discharge and energy dissipation.At present,there are a variety of research results of the shape of the nose,which eliminates part of the energy through the diffusion,turbulence and aeration of the jet in the air.If the existing pick-up nose type is adopted,the water jet carries a huge energy,causing the water tongue to cause severe erosion on the left and right banks and downstream.For the safety of reservoirs and downstream buildings,it is necessary to optimize the shape of the spillway.The purpose is to eliminate part of the water flow energy,reduce the energy carried by the water tongue,and avoid the flushing of the water tongue to the left and right banks and downstream.This is important for safe flood discharge of the damIn this paper,the physical model,the mathematical model and the combination of the two are used.The Kongliang Reservoir Hub is the specific research object.The water level difference between the upstream and downstream of the Kongliang Reservoir is about 130m,and the mountain slopes are steep,the valley is narrow and downstream.There are special terrains such as buildings in the river about 185m.The hydraulic design of the spillway of Kongliang Reservoir and the optimization of the shape of the nose nose are studied and analyzed.According to the comparison of several schemes,compared with the overall energy dissipation rate of the spillway,Thereby,the spillway body shape of the ladder+the stilling pool+the picking nose is obtained.Through the establishment of the mathematical model of the optimization scheme,the relationship between the radius of the pick and the radius of the nose and the angle of the pick-off,and the angle of the pick-off angle are summarized.The structural laws of the nose-carrying nose are summarized,and in 6m?R?12m,18°???24°,16.56m/s?v?21.89m/s.Within the scope,the mathematical model is used to calculate the span of multiple sets of flow,and the pitch formula is fitted according to the calculated value.By comparing with the existing formulas,the above formula proves that the formula has certain rationality,and the related results can be applied to the pitch prediction of similar pick-up energy dissipation structure,which has important engineering significance and academic value.In general,the research results of this paper can be applied in the energy dissipation structure of similar hydropower stations on the spillway of the Gaoshui Hub,providing technical support for the hydraulic design of the spillway and avoiding problems such as bank slope and downstream scouring.