黏性液体撞击流三次雾化的理论和实验研究

发布时间：2018-04-15 10:16

本文选题：润滑 + 撞击流　；参考：《东北大学》2011年硕士论文

【摘要】：黏性液体雾化后所获得的颗粒粒径多在数十微米以上,而常规的一次或二次雾化方式,对于5μm以下的超细微粒径的雾化颗粒的获得,由于能耗较大,雾化效率不高。本文主要是利用二次雾化后流体的剩余能量,实现对于较大雾化颗粒的再次雾化,即三次雾化。本文对撞击流三次雾化技术的理论进行了研究。重点讨论了影响撞击流雾化技术的影响因素；油雾颗粒在相互碰撞时受到的弹性力、液桥力、范德华力和静电力等作用力；分析了激光散射法对于颗粒尺寸的测量；分析三次雾化后的粒径及浓度变化,并设计搭建了油雾颗粒碰撞实验台。实验中利用自制喷嘴对雾化效果进行测试。通过对大量实验数据的分析,得出喷嘴喉部直径、撞击距离、油雾温度、压缩空气流量与三次雾化后油雾颗粒粒径的关系,及碰撞前后油雾颗粒粒径变化率。确定喷嘴喉部直径和空气流量是影响实验效果的关键因素。
[Abstract]:The particle size obtained by viscous liquid atomization is more than tens of microns, but the conventional primary or secondary atomization method is not effective because of the large energy consumption and the low atomization efficiency for the atomized particles with ultrafine particle size below 5 渭 m.In this paper, the residual energy of the fluid after the secondary atomization is used to realize the reatomization of the larger atomized particles, that is, the third atomization.In this paper, the theory of impinging stream triple atomization technology is studied.The influence factors of impinging flow atomization technology, the elastic force, liquid bridge force, van der Waals force and electrostatic force of oil fog particles are discussed, and the measurement of particle size by laser scattering method is analyzed.The change of particle size and concentration after three times atomization was analyzed, and an oil fog particle collision test bench was designed and built.The atomization effect was tested by self-made nozzle in the experiment.Based on the analysis of a large number of experimental data, the relationship between nozzle throat diameter, impact distance, oil mist temperature, compressed air flow rate and the diameter of oil mist particles after three times atomization, and the change rate of oil mist particle size before and after impact are obtained.Determining the nozzle throat diameter and air flow rate is the key factor affecting the experimental results.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TQ541;O35;TH117.2

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