Numerical Simulation Of The Flow-induced Vibration Of The Plane Gate Under The Condition Of Upstream And Downstream Pressure

As an important part of hydraulic structures,plane steel gates are widely used in various water conservancy projects.In recent years,the high-head,high-flow power stations has been continuously constructed,and higher requirements have been placed on the safety and reliability of the operation of plane steel gates.The vibration problem of plane steel gates will directly affect its safe operation.Under extreme circumstances,plane steel gates will be destroyed,causing serious safety accidents.The internal reason of plane steel gate vibration is its natural vibration characteristics,and the external cause is the existence of pulsating pressure and negative pressure caused by the flow through the gate.As the direct flow surface,the flow velocity at the bottom of the flat steel gate in the flow channel is the largest,and its bottom structure type will also have a relatively larger impact on the flow state of the gate flow.In this paper,the plane steel gates under the pressure conditions above and downstream are the main research objects.With reference to the provisions of the national standard,four types of gate bottom edge structure types are respectively set up.First,the two-dimensional flow field numerical simulation was performed using Fluent,and then the one-way fluid-structure coupling numerical simulation was performed using the Ansys Workbench platform.The main contents and conclusions of this paper are as follows:(1)Using ICEM to establish two-dimensional plane gate over-current model and pre-processing.Based on Fluent,two-dimensional flow field numerical simulation of four groups of gates,calculation of flow field velocity vector,dynamic pressure and other parameters,preliminarily analysis the influence of the different bottom types gate on the characteristics of water flow through the gate.(2)Based on the Ansys Workbench platform,four sets of gates with different bottom edge types are established,two operating conditions are set,and one-way fluid-structure coupling numerical simulation is performed.The flow field partially validates the partial results of the two-dimensional flow field simulation.The structural analysis part numerically calculates the deformation,stress distribution and shear stress distribution of each plane of the gate structure through numerical calculations of the four groups of gates under two working conditions.(3)Through the above two-dimensional and one-way fluid-structure coupled numerical simulations,the influences of different types of gate bottom edge structure on the flow through the sluice are compared and analyzed;by setting the same operating conditions,the deformation of the bottom edge of the different gates is compared.Based on the situation and stress distribution,combined with the strength theory,the gates with different bottom edge structures were analyzed.By setting different operating conditions,the variation of the gate deformation and stress when the inlet velocity was increased was obtained.