收缩管型压电式喷头微滴喷射仿真及实验研究

摘要

In order to explore the law of internal flow and droplet formation in the process of injection,established a two-dimen-sional axisymmetric finite element model by Gambit,the numerical simulation method based on VOF model and moving-grid tech-nology of Fluent was used to analyze the injection process of the shrink tube type piezoelectric printhead,and to establish the in-jection system to test the micro droplet injection to study on the formation mechanism of micro -droplet jetting,and to analyze the formation of droplet and attached droplet.The results show that vibration boundary movement caused internal pressure change, which led to the formation of the long liquid zone and micro droplets;the pressure value at the entrance of the inlet affected the production of droplet and attached droplet;available inlet pressure range existed in the specific vibration boundary movement.%为探究收缩管型压电式喷头微滴喷射过程中内部流场变化规律以及微滴形成过程,利用Gambit软件建立二维轴对称有限元模型,基于Fluent动网格技术,采用VOF两相流模型,对微滴喷射过程进行仿真分析,研究了微滴形成机理.建立微滴喷射系统对微滴喷射过程进行实验,分析收缩管型压电式喷头工作时入口压强对尾滴、附着液滴形成的影响规律.结果表明:储液腔的振动边界运动引起内部压强变化,导致长液带形成,并断裂形成微滴;入口压强影响尾滴与附着液滴的形成;特定振动边界运动存在对应的可用入口压强范围.