超低温球阀流热固耦合仿真分析

Simulation Analysis of Fluid-thermal-solid Coupling for Cryogenic Ball Valve

超低温球阀广泛应用在LNG输送等低温工程领域。本文对LNG领域的超低温球阀进行了流热固耦合仿真试验,对超低温球阀的温度和应力进行分析。结果发现:超低温球阀从阀盖底部法兰往下,温度都非常低;阀体、阀盖、阀杆、球体、阀座上结构发生突变的位置容易产生应力集中;阀体、球体、阀座等内表面上的等效应力要大于外表面。

Cryogenic ball valves are widely used in cryogenic engineering fields such as LNG transportation.In this paper,the temperature field and stress field of a cryogenic ball valve used in LNG field were obtained by fluid-thermal-solid coupling simulation.The results show that the temperature of the cryogenic ball valve was very low from the bottom flange of the bonnet.Stress concentration occurred at the position where the structure changed suddenly on the valve body,bonnet,stem,ball and valve seat.The equivalent stress on the inner surface of valve body,ball,valve seat,etc.were bigger than that on the outer surface.