旋流管内液相动态行为的可视化研究  

Visualization of liquid phase dynamic behaviors in swirl tubes

作　　者：刘帅[1] 王建军[1] 郑官军 王泽龙 LIU Shuai;WANG Jian-jun;ZHENG Guan-jun;WANG Ze-long(College of New Energy,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《高校化学工程学报》2020年第2期356-367,共12页Journal of Chemical Engineering of Chinese Universities

基　　金：中国石油大学(华东)研究生创新工程资助项目(YCX2018041)。

摘　　要：为探究旋流管气液分离过程,采用激光粒度分析仪和高速摄影技术对其内部液相动态行为进行可视化研究,结果表明:在具有结构参数梯度的两级导叶协同作用下可实现对不同粒径液滴的分级分离;壁面液膜形态与入口气速密切相关,在低入口气速下,在壁面无法形成环状液膜,随着入口气速在合理范围内不断增加,形成的环状液膜沿壁面逆流排出,完成逆流排液方式的气液分离过程;当入口气速高于17.5 m·s^-1时,形成的液膜以"螺旋液带"的形式螺旋上升至排液侧缝,完成顺流排液方式的气液分离过程;在旋流场中进行的有效气液分离动态过程可理解为液相"捕集-破碎-再捕集-再破碎"的良性循环机制,且"子液滴群"和"初始液滴群"共同制约分离效率。In order to explore gas-liquid separation processes in a swirl tube,the dynamic behaviors of liquid phase in a swirl tube were visualized using a laser particle size analyzer and high-speed photography technology.The results show that graded separation of droplets with different particle sizes can be achieved under the synergistic action of two-stage guide vanes with the gradient of structural parameters.The shape of the liquid film on the wall was closely related to the inlet gas velocity.At low inlet gas velocities,annular liquid films cannot be formed on the wall.With the increase of inlet gas velocity in a reasonable range,the annular liquid film was discharged counterflow along the wall to complete the gas-liquid separation process.When the inlet gas velocity was higher than 17.5 m·s^-1,the liquid film spirally raised along the wall to the vertical slit of the drainage,thus completing the gas-liquid separation process in downstream drainage.The dynamic process of effective gas-liquid separation in a swirling flow field shows benign circulation mechanism of liquid phase"capture-break-recapture-re-break",and the separation efficiency is constrained by both"daughter droplet group"and"initial droplet group".

关 键 词：液滴 液膜 可视化 粒径分布 旋流管 

分 类 号：TQ051.8[化学工程]