为了研究核电主汽阀关闭时流场的变化情况及阀板的受力情况,利用计算流体力学软件FLUENT对主汽阀二维简化模型的流场进行了稳态和不同关闭速度的动态数值模拟,得到了阀门的动态流场信息及阀板的受力分布曲线。通过分析可知,阀板两侧的压力差产生的摩擦力是决定阀门能否正常关闭的关键因素,关闭速度越快所受到的摩擦力越大。 In order to study the change of flow field and the stress of the valve plate when the main steam valve closed, the dynamic numerical simulation of steady-state and different closing speed of two-dimensional simplified model was carried out by using FLUENT software. , Got the valve dynamic flow field information and the valve plate stress distribution curve. The analysis shows that the frictional force generated by the pressure difference on both sides of the valve plate is the key factor that determines whether the valve can be normally closed. The faster the closing speed is, the greater the friction is.