液动无控型单向阀关闭特性CFD分析

CFD Analysis of Closing Characteristics of Hydraulic Non-Control Check Valve

针对自由落位单向阀在没有弹簧和外力的作用下实现单向开闭的功能这一特性进行了分析、假设、仿真和论证。首先通过嵌套动网格的方式搭建了单向阀CFD仿真模型,然后分析了单向阀小球在不同位置时的受力情况,最后计算了不同流量和小球质量情况下单向阀的闭合特性。仿真研究发现,小球运动过程可近似分为匀速和加速两个阶段,流量越大小球在第一阶段获得的速度越大,小球质量越小在第二阶段加速越快。

Aiming at the feature of the free-falling check valve to realize the function of one-way opening and closing without the action of spring and external force,this paper carries out analysis,hypothesis,simulation and demonstration.First,a CFD simulation model of the one-way valve was built by nesting the moving grid.Then the force situation of the check valve ball at different positions is analyzed.Finally,the closing characteristics of the check valve under different flow rates and ball masses are calculated.The simulation results found that the ball movement process can be roughly divided into two stages:uniform speed and acceleration.The larger the flow is,the greater the speed of the ball can obtain in the first stage,and the smaller the ball's mass is,the faster the ball will accelerate in the second stage.