船用核动力装置止回阀的流固热耦合研究

针对船用核动力装置中止回阀的泄漏问题，利用流固热耦合仿真方法研究了温度快速变化对止回阀的影响，结果表明:止回阀的等效应力和变形量随温度的降低而降低；密封压垫和四合环最大等效应力位于阀门管道两端，最大变形量位于阀门前后部位；密封压垫的最大变形量和收缩率都比四合环大；由于高温高压的作用，密封压垫与阀盖之间产生了明显的间隙，易发生泄漏，且该间隙随温度的降低而扩大，可能加剧泄漏。 

Research on Fluid-Solid-Heat Coupling for Check Valves in Marine Nuclear Power Plants

Aiming at the leakage of check valves in marine nuclear power plants, the effect of rapid temperature change on the check valves is studied by the fluid-solid-heat coupling simulation method. The results show that the equivalent stress and deformation of check valves are reduced with the decreasing of temperature, the maximum equivalent stresses of the sealing gasket and the quarter ring are at the ends of the valve pipe, and the maximum deformations are at the front and rear of the valve. The maximum deformation and shrinkage of the sealing gasket are larger than that of the quarter ring. Because of high temperature and pressure, there is a clear gap between the sealing gasket and the valve cover, and it can easily lead to leakage. The gap increases with the decreasing of temperature, which may intensify the leakage.