不同含气率下球阀内部流动特性试验及其数值模拟  

Experimental Study and Numerical Simulation of Two-phase Flow Characteristics on Ball Valve under Different Gas Rate

作　　者：卢圣旺 马艺[1,2] 郑生宏[3] 张生昌[1,2] 邓鸿英[1,2] 朱乐乐[1] 

机构地区：[1]浙江工业大学,浙江杭州310014 [2]过程装备及其再制造教育部工程研究中心,浙江杭州310014 [3]长庆油田,陕西西安710018

出　　处：《流体机械》2017年第4期1-6,共6页Fluid Machinery

基　　金：国家自然科学基金资助项目(51406183)

摘　　要：为研究不同含气率对油气混输泵泵阀内部流场的影响,运用CFD软件对油气混输泵球阀内部气液两相分布、速度场及进出口压差进行了模拟仿真。同时对球阀进行试验研究,测量出球阀进出口的压力值,以验证模拟结果的准确性。试验表明:模拟值与试验值数据误差不超过15%,模拟较为准确。在相同的开启高度、进出口流量下,随着含气率的增加,球阀内流体的压差降低幅度高达90%以上,且其降低较均匀。与此同时,流体密度降低并没有使流量系数和阻力系数有明显的变化。观察两相云图可以发现,在阀球尾部A处产生了旋涡,旋涡随含气率的增加略微增多;突扩界面C处产生了二次回流,使得该处的气相也较多,而在阀球四周内壁,气相分布较少。同时可观察出,流体含气率对阀球间隙处速度的影响不大,但是对流动状态有一定的影响。To study the flow field law of the inside of oil-gas multiphase pump, numerical simulation were employed to get gas- liquid two-phase distribution and velocity inside the ball valve and the differential pressure between inlet and outlet of oil-gas mul-tiphase pump. In the meantime, pressure of inlet and outlet were measured by doing experiment on the ball valve to confirm the ac-curacy of numerical simulation. The results show that the differences between the numerical simulation data and the experiment data is less than 15% . Under the same opening height and the same flow,with the increase of gas content,the differential pressure inside the ball uniformly reduces more than 90%. In the same time,the decrease of fluid density does not make apparently change of the flow discharge coefficient and the flow resistance coefficient. From the cloud contours it can be see that there is vortex in the point A which at the end of the valve ball. Vortex in point a slightly increases with the increase of gas content. Because of the pro-duction of the secondary circulation in the sudden enlargement interface C,gas phase also increase in this place. On the contrary, the distribution of gas phase becomes less around the valve ball wall. Gas content has not great effect on velocity of ball valve gap, but have a certain influence on the flow regime.

关 键 词：两相流 气液两相球阀 含气率 计算流体力学(CFD) 

分 类 号：TH137.5[机械工程—机械制造及自动化]