摘要
根据第三代核电技术AP1000中非能动堆芯冷却系统对低压差开启止回阀的技术要求,针对现有旋启式止回阀的结构特点及其在反向压力高、流速快的工况下易发生撞击,引起阀瓣损坏和产生较大噪声的缺点,设计了一种新型梭式结构止回阀。介绍了该阀的基本结构和工作原理;分析了阀内部的湍流特点和基于Reynolds平均法的湍流时均控制方程,并运用计算流体动力学软件中的不可压缩流体流动的标准k-ε模型对梭式止回阀进行了数字仿真;提出了以压力损失最小为目标,对支承架开设泄流孔、减少阀体直径突变和在阀芯增加外弧面的结构优化方案,仿真结果表明优化后压力损失减小了21%。
in order to overcome the shortcomings of the existing swing check valves that generate noise and are easy to be damaged by impact when they are subjected to high reverse pressure and high flow speed, a new shuttle-type check valve was designed. The basic structure and the work principle of this new check valve were introduced. Moreover, the characteristics of the turbulent flow in the check valve and the governing equations based on Reynolds average method were analyzed. The operation process of the shuttle-type check valve was then simulated using the standard k - 8 model. Further more, through several ways including opening discharge hole on the beating, reducing sudden change of the diameter of the valve body, and setting curved outer surface on the core, a structural optimization algorithm that aims to minimize the pressure drop was proposed. Numerical simulation results showed that the pressure drop in the opti- mized structure can be reduced by 21%.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2014年第2期160-165,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家重大科学仪器设备开发专项资助项目(2012YQ130226)
关键词
梭式止回阀
计算流体力学
数字仿真
优化设计
shuttle-type check valve
computational fluid dynamics
digital simulation
optimization design
