Numerical Simulation Analysis Of The Flow Pattern Of Multi-functional Gate Station

The multi-functional gate station is gradually applied in the major farmland water conservancy.The hydraulic structure with two-way circulation and gate station combination plays a huge role in the farmland water conservancy application in the coastal low-lying areas This kind of gate station has better flow pattern requirements for the upstream and downstream sections.If the upstream and downstream sections are not handled properly,there will be backflow,bias flow and vortex,which will lead to river sedimentation or sand flushing,and may also lead to slope protection damage.These will bring about the increase of pressure of energy dissipation and progression of erosion,but also have a significant impact on the safety of the water conservancy project,impairing the service life of the project.This kind of multi-functional gate station is mainly a gate station combining irrigation and drainage.The water pools on both sides are both the inlet side and the outlet side.In this paper,to solve the problems of turbulence,backflow and vortex on the outlet side,the wing wall optimization scheme is adopted to solve the above problems.In this paper,UG modeling software and ANSYS calculation software are used to simulate the outlet side of the sluice station,and the parameters of the outlet wing wall are optimized to achieve the best flow pattern.The wing wall form,radius size and the length of straight wing wall at the outlet under the four working conditions of self irrigation,self drainage,pumping irrigation and pumping drainage are optimized.Then the flow on the outlet side continues to be numerical simulated to study the flow pattern on the outlet side of various schemes.Combined with the actual engineering quantity,an optimal scheme suitable for the gate station is foundIn this paper,two main factors are considered respectively:the form and radius of wing wall and the length of straight wing wall at the exit.Then the streamline diagram and velocity distribution cloud diagram of the multi-functional gate station are obtained through numerical simulation,and two conclusions are obtained:first,the reasonable design of wing wall at the outlet side of the gate station will have a positive impact on the flow pattern at the outlet side,and the arc wing wall with appropriate radius and width is better than the flow pattern of the oblique splayed wing wall;second,the length of the straight wing wall at the outlet of the gate station will have a positive impact on the flow pattern at the outlet side of the gate station The longer the length of the wing wall is,the better the flow pattern is.However,in view of the engineering practice,it is necessary to consider the size of quantities,too large wing wall radius or too long wing wall length,which will lead to unnecessary waste,and the effect is not necessarily better.Therefore,it is vital to find a right balance between the moderate quantities and a better flow pattern.In this paper,through the reconstruction and maintenance of multi-functional gate station in saline alkali area,more engineering experience is obtained.This paper will provide a guiding significance among new type of multi-functional gate station combined with irrigation and drainage in China,and the results can also be used as a reference in actual projects,which has an important role in improving the water conservancy efficiency of farmlands,and has important guiding significance for the service life of the gate station and the safety of the hub.