中文摘要：

采用流固耦合数值模拟技术研究安溢活门/气罐系统充放气动态特性。计算中所用流体控制方程为三维Euler方程,采用非结构网格有限体积格式求解;固体结构的运动方程由拉格朗日方程导出,采用纽马克方法求解。提出可变边条零厚度虚拟挡板技术,模拟主活塞由闭到开的瞬态过程。计算得到开阀和关阀过程中弹性元件的动态响应特性,结果表明,主膜片在行程上限和下限处均产生高频振荡运动,在开阀和关阀瞬间主膜片受到冲击载荷作用,并且关阀时载荷出现振荡。这种振荡冲击可能是导致活门鸣叫和膜片破坏的原因。

英文摘要：

Fluid-solid coupling numerical simulation technique is adopted to research the dynamic characteristics of safety valve / gas tank system charging and discharging. The fluid control equation used in the computation is three-dimensional Euler equation, and finite volume scheme of unstructured grid is adopted for solution. The motion equation of solid structure is derived from Lagrange equation, and Newmark method is adopted for solution. The technique of zero-thickness virtual baffle with variable strake is proposed to simulate the transient process of the main valve from closing to opening. The dynamic response characteristic of elastic element in the process of opening and closing of valve are obtained through computation. The results show that the main diaphragm produces high frequency oscillation at both places of upper and lower limits of travel. The main diaphragm is subjected to the action of impact load at the instant of opening and closing of valve, and oscillation of load occurs at the instant of closing of valve. This oscillation impact could be the cause of valve screaming and diaphragm damage.