摘要
基于两相界面追踪方法 VOF(volume of fluid)模拟了离心式喷嘴内部的流动过程,得到了液相填充喷嘴内部的过程,初始时刻,气液界面出现褶皱,随着进入液体的增多,褶皱逐渐消失;着重分析了喷嘴各个部位速度、压力分布,由于气液两相的存在,喷嘴内部流场变得异常复杂,流场分布不能用单相流的模式分析,总压损失大部分存在于喷嘴收缩段以及直管段,增大收缩段锥角、减小收缩段长度有利于减小总压损失;在喷嘴出口处设置一定扩张角,能够增加液相速度,减小液膜厚度,有利于雾化.
Interface-tracking method volume of fluid（VOF） was used to simulate the flow process in pressure-swirl injector.The process of liquid phase filling injector was exhibited：pucker appears at first,then distinguishes with the increase of liquid.Velocity and pressure distribution were especially analyzed in different sections of injector.As both liquid and gas phase coexist in the injector,the flow field is highly complex.Total pressure loss lies mostly in the convergent and columned sections,so increasing convergent angle helps to reduce total pressure loss.Setting a divergent angle at injector exit can increase liquid phase velocity and reducing liquid sheet thickness can get better atomization finally.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2011年第9期1986-1994,共9页
Journal of Aerospace Power
基金
国家自然科学基金(10802095)
关键词
流体体积法
离心式喷嘴
总压损失
液膜厚度
雾化
volume of fluid（VOF）
pressure-swirl injector
loss of total pressure
liquid sheet thickness
atomization
