气液两相流下单向球阀动态特性数值模拟  

Numerical simulation on dynamic characteristics of one-way ball valve under gas-liquid two phase flow

作　　者：张生昌[1] 朱乐乐[1] 马艺[1] 邓鸿英[1] 王伟华[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014

出　　处：《浙江工业大学学报》2016年第1期1-4,共4页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(51406183)

摘　　要：基于对单向阀球的受力分析,建立单向球阀运动规律的数学模型,并进一步利用Fluent动网格和UDF仿真技术模拟单向球阀的启闭过程,研究了介质含气率、阀球材质对球阀动态特性的影响.模拟结果表明:随着介质含气率由0%增至80%,同一时刻的阀隙开度不断减小,阀球上下表面压差增长幅度达到2倍,且阀球能达到的最大升程、速度不断降低至纯液相工况的1/2以下.当阀球密度由3 800kg/m^3增大到8 900kg/m^3时,阀球上升速度减慢,球阀能达到的最大升程、速度逐渐减小,且球阀达到最大升程所需的时间也越长,尤其是含气率≤0.3时更为突出.Based on the analysis of forces in valve ball,the mathematical model describing the movement of one-way ball valve was established.The opening and closing process of ball valve was simulated by using the dynamic grid and UDF technology based on FLUENT software.The influences of gas fraction and valve ball material on the performance of ball valve were studied.The dynamic simulation results show that with the increase of gas fraction from 0%to 80%,the opening height of valve clearance decreases,and the growth rate of pressure difference on the surfaces of valve ball are up to 2times.In addition,the maximum lift and velocity of valve ball are decreasing to half or less of that of liquid phase.When the densities of valve ball increase from 3 800kg/m^3 to 8 900kg/m^3,the maximum lift and velocity of valve ball are decreasing,and the time to reach the maximum lift of valve ball is longer,especially when the gas fraction is less than or equal to 0.3.

关 键 词：球阀 含气率 阀球材质 动态特性 

分 类 号：TH137.5[机械工程—机械制造及自动化]