Analysis Of Hydraulic Characteristics Between Columns

At present,most of the researches on the structure of cylinder group focus on the analysis and discussion of single cylinder,series cylinder,column spacing,flow resistance,drag coefficient,hydrodynamic coefficient and so on.At present,the analysis of energy dissipation effect of column group structure is less,so this thesisr analyzes the energy dissipation effect of column group in the stilling basin.In this thesis,by means of physical model test and theoretical analysis,the hydraulic characteristics between column group test and damping pool test are discussed.Combining the column group structure with the damping pool,a new type of auxiliary energy dissipator is introduced,which is the cylinder group structure arranged in the rear section of the damping pool.By changing water and downstream water depth and the column group of decorate a form,from the flow field flow,average flow velocity along the horizontal section of the vertical average velocity and average flow velocity along the longitudinal generalized analysis of energy dissipation,out of the pool column group velocity before and after the situation,the pool camp after the quantitative analysis of energy dissipation effect in the calculation of velocity and energy dissipation,the following main conclusions:Column group of tests,the lateral velocity distribution in the study area under different decorate a form show different forms,including staggered column group of lateral velocity distribution is uniform,vertical velocity before and after the difference is larger,and with the increase of the length of column group velocity is smaller,distribution is more even,the dissipation is higher,therefore it is concluded that staggered column group had better effect of energy dissipation between;After the staggered column group was arranged in the tank,the water level in the tank increased slightly,the surface velocity first increased and then decreased,and finally the flow velocity distribution was formed,which was smaller on the surface and larger at the bottom of the tank.The overall flow velocity distribution was uniform,and the water jump in the stable tank was good,and the energy dissipation effect was good.The energy consumption rate can reach about 40%?70%.The energy consumption rate does increase after the column group structure is arranged in the pool.When the downstream water level is controlled at a certain height,the energy consumption rate does not increase at about 40% after the column group structure is arranged in the pool.In most cases,the energy consumption rate is in the order of staggered arrangement in the pool > intensive arrangement in the pool > stilling pool.In this thesis,by discussing and analyzing the hydraulic elements between column groups,it is concluded that the combination of column groups and stilling pool can give full play to the effect of the two on the flow disturbance,which has a certain reference effect on the in-depth discussion of the energy dissipation of structural channels and DAMS containing column groups.Through the energy dissipation effect between column groups,the safety of downstream hydraulic structures can be protected.Therefore,the in-depth study of hydraulic analysis between columns and the study of its hydraulic characteristics and energy dissipation effect not only has theoretical significance,but also has obvious social and economic benefits.