紧耦合旋涡环缝式雾化器的初级液体雾化机理研究  

Research on the primary liquid atomization mechanism of a close-coupled vortical loop slit atomizer

作　　者：章敏 张召明 刘秋生 Min Zhang;Zhaoming Zhang;Qiusheng Liu(Key Laboratory of Microgravity(National Microgravity Laboratory),Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;College of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]不详

出　　处：《Acta Mechanica Sinica》2023年第8期9-24,共16页力学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.11532015 and U1738119);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).

摘　　要：为了初步探究紧耦合旋涡环缝式雾化器在真实条件下的液体雾化过程,本文在对旋涡环缝式雾化器气体单相流场特性分析的基础上对金属熔体破碎后形成的并不再继续破碎的雾化液滴在旋流场中的飞行轨迹进行基于离散相模型的数值模拟.研究结果表明:在雾化室内导液管前端中心孔液滴源位置处,自距气流场中心轴线距离越远的液滴源进入旋流场中的雾化液滴在导液管前端径向铺展范围越大.自雾化室内导液管前端中心孔液滴源进入旋流场中的雾化液滴其直径越大则在导液管前端沿径向铺展的范围越小.气流场中的回流区域和雾化液滴自身动能对雾化液滴在旋流场中的飞行轨迹有很大的影响,并且旋涡环缝式雾化器对金属熔体存在两种破碎模式,即波动破碎模式和膜状破碎模式.模拟结果可为旋涡环缝式雾化器在真实液体雾化过程中雾化模式的分类提供参考.To preliminarily investigate the liquid atomization(LA)process of a close-coupled vortical loop slit atomizer under realistic conditions,a numerical simulation of the flying trajectory of atomized droplets which were formed after the breaking of a metal melt and would not break anymore in the swirling flow field was carried out with the discrete phase model(DPM)based on analysis of the single-phase flow field characteristics of the gas.The results demonstrate that the radial paving scope of atomized droplets that are far away from the central axis and enter into the flow field from the source position expands at the front end of the melt delivery tube(MDT).The radial pavement scope of these atomized droplets at the front end of MDT is negatively correlated with their diameter.The recirculation zone(RZ)in the flow field of the vortical atomizer and the kinetic energy of the atomized droplets can significantly influence their flight trajectories.Moreover,two breakup models can be applied to a metal melt in a vortical atomizer—a fluctuating breakup model and a sheet breakup model.

关 键 词：液体雾化 破碎模式 雾化器 雾化室 离散相模型 金属熔体 气流场 雾化液滴 

分 类 号：TG14[一般工业技术—材料科学与工程]