液压高速开关锥阀流场仿真特性研究

Fluid simulation performance study of hydraulic high speed on-off cone valve

为了探究高速开关锥阀的静动态特性,在ANSYS Workbench中的Fluent模块进行模型导入、网格划分、边界条件定义、参数设置、求解和后处理,得出静动态仿真中的压力特性和速度特性。动态特性仿真使用动网格中重叠网格的计算方法,在Spaceclaim中建模并通过Fluent求解。静态仿真阀口位置和下游流道位置处的速度迹线反映了不同流体微元的运动轨迹;动态仿真结果显示:(1)能量利用率为37.5%时对应的阀芯升程绝对速度为0.6 m/s,该时刻开关阀的动态响应特性最佳;(2)开关数字阀开启运动时,出口最大速度大于进口最大速度;(3)开关阀在开启运动工况下,进口最大流量大于出口最大流量,这和下游流道涡流能耗有关。

The stability of high speed on-off cone valve is fit for various application.In order to investigate the static and dynamic performance of high speed on-off cone valve,by the fluid simulation process on the ANSYS workbench,it concludes the pressure performance and the velocity performance mainly.The CFD-post results of static simulation shows that the velocity streamline reflects the movement path line of different fluid element.The dynamic simulation results are as follows:1)the dynamic response performance is best when the absolute velocity of poppet valve is 0.6 m/s,in this condition,the capacity usage ratio is 37.5%;2)the biggest outlet velocity is slightly larger than the inlet velocity when the on-off valve is lifting normally;3)when the on-off valve is lifting,the biggest flow rate of inlet is larger than that of the outlet,which is related to the production of turbulent energy dissipation in the downstream fluid domain.