气泡雾化喷嘴下游流场的特性分析

An Analysis of Downstream Distance Spray Characteristics of Effervescent Atomizer

用Fluent软件对气泡雾化喷嘴下游不同截面雾化液滴的平均直径和速度分布进行了模拟计算。分析了雾化粒径与喷嘴直径、气液质量比、气体压力和液体流率之间的关系,以及雾化粒径和流动速度随喷嘴距离(轴向和径向)的变化规律。结果表明,雾化粒径与喷嘴直径之间呈近似正比关系,与气液质量比之间呈近似反比关系,而与气体压力和液体流率之间则存在最优匹配问题。随着喷嘴距离的增大,雾化粒径增大,而流动速度减慢。

The Fluent software was used to carry out the simulation calculation of average diameter and velocity distribution of the atomization fluid drop with different traverse sections under the downstreaw of effervescent atomization nozzle. Also, the relations between atomized particle size and nozzle diameter, gas-liquid ratio, gas pressure and liquid flow rate as well as atomized particle size and flow velocity with the varying law of nozzle distance（axial direction and radial direction） were analyzed. The results indicate that the atomized particle size appears to be approximately possitive proportional to nozzle diameter and to be approximately inverse proportional to the gas-liquid mass ratio, whereas there exists an optimal matching problem between gas pressure and liquid flow rate. Accordingly,as the nozzle distance increases, the atomized particle diameter increases whereas the flow velocity reduces.