梭式止回阀开启过程的数值模拟  

Numerical simulation of opening process of shuttle check valve

作　　者：李良超[1] 曾祥炜[1] 向科峰[1] 徐斌[1] 宋丹路[1] 

机构地区：[1]西南科技大学制造科学与工程学院,四川绵阳621010

出　　处：《排灌机械工程学报》2012年第6期710-714,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：四川省科技厅应用技术研究与开发项目(2012JY0050)

摘　　要：为了研究梭式止回阀在高压差条件下启闭时阀瓣的运动特性以及阀内可能出现的气穴现象,采用计算流体力学(CFD)方法,建立梭式止回阀阀瓣运动方程和流场气穴模型,并通过动网格技术和用户自定义程序,对梭式止回阀开启过程中阀内速度场、压力场、气穴分布和阀瓣运动特性进行了数值仿真,仿真结果以可视的图形图像形式给出.数值模拟研究表明:梭式止回阀在开启过程中,流体主要沿阀壁流动,阀体中间部位则出现回流;在阀内有涡流存在,在涡流的涡心位置流体流速小、压力低,易产生气穴;气穴的产生和发展与进出口压力大小和阀瓣开度等密切相关,气穴易引起阀内流场的不稳定.阀瓣在压差作用下的运动特性为阀瓣首先开启到一极大开度,并逐渐以波动的形式回归到一稳定的开度,阀瓣在运动到稳定开度附近时速度最大.模拟研究结果可以为梭式止回阀结构参数的设计和优化等提供参考.The flow field in a shuttle check valve was numerically simulated by using the CFD method to examine whether the valve is subjected to cavitating flow during its opening process.A user defined subroutine and a dynamic mesh technique were used to involve the pool motion.The results show that the fluid flows mainly along the valve wall and backflow formed in the center of the valve during its opening process.And there have vortices existing in the shuttle valve.Cavity onsets easily in the center of the vortex as the pressure there is the lowest.The inception and development of cavitation in the valve are closely related to the inlet and outlet pressure and valve opening degree.Furthermore,cavitation can cause flow instabilities.It is demonstrated that under a certain pressure difference,the valve spool is opened to the maximum degree initially and then gradually rebound to a stable position with fluctuating steps.

关 键 词：梭式止回阀 开启过程 气穴 计算流体力学 数值模拟 

分 类 号：S277.9[农业科学—农业水土工程] TH137[农业科学—农业工程]