安溢活门动态流场数值模拟研究

为了研究安溢活门主阀开启过程中的动态流场特性,采用Fluent动网格法和用户自定义函数方法对其进行流固耦合数值模拟。通过Fluent 3D非定常显式耦合求解器以及虚拟挡板技术求解某时刻主阀腔内的气压力,并通过有限气容充放气过程方程确定背压腔充放气过程对膜片的气压力,得到膜片上的总和力。进而通过求解质量弹簧阻尼系统动力学方程确定主、副活阀的运动速度和位移。结果表明:活门开启过程中开度越大,阀道内流场越复杂,流动越不稳定;活门开度增大,阀座处流量线性增加,入口腔流量变化平稳,而出口腔流量波动较大;随着开度增加,活门不同位置和膜片上的气压力变化规律不同。

Numerical Simulation Research of Safety Valve Dynamic Flow Field

To research the dynamic flow field characteristics of main valve during the safety valve opening period, the user-defined function method and Fluent dynamic mesh method with virtual technic are used for initial fluid-structure interaction numerical simulation. The pressure force of diaphragm is obtained through solving the air-capacitor filling and exhausting process equation, while valve speed and displacement are solved through the mass-spring-damping system dynamic equation. Results show that flow filed becomes more complex and unstable with larger valve opening degree. To analyze the factors affecting the dynamic instability of flow field, the relationships between the opening degree and flow changes of inlet, outlet and throat are researched, also pressure changes of the valve and diaphragm are studied.