基于Mixture模型的乙醇汽油割嘴气液两相流模拟  

Based on fluent of ethanol fuel nozzle internal flow field of the cold state simulation

作　　者：孔维宾[1] 蒋应田[1] 梁平[1] KONG Weibin, JIANG Yingtian, LIANG ping(School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, China)

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001

出　　处：《电焊机》2018年第6期118-122,共5页Electric Welding Machine

基　　金：抚顺市科学技术计划项目(20091202)

摘　　要：通过Mixture模型对专用割嘴的内部进行速度场和压力场数值模拟,分析割嘴内部流场的气液两相流流动状态,以及速度和压力在各部位的变化情况,研究不同压力下的氧气流对乙醇汽油燃料的速度变化以及在一定压力下的氧气流对不同速度的乙醇汽油雾化的影响情况。分析流体外部两侧的静压强的欠膨胀,认为欠膨胀射流有利于空气与液体燃料的混合。模拟结果表明,增加气液混合物的速度差可以提高割嘴出口处乙醇汽油的雾化程度,有利于充分燃烧。In this paper,the velocity- field and pressure field numerical simulation of the special cutting nozzle are earned out by Mixture model,the flow state of gas-liquid two phase flow in cutting nozzle is analyzed,and the change of velocity- and pressure at different positions are analyzed. To study the effect of oxygen flow at different pressures on the speed change of ethanol fuel and the effect of oxygen flow under certain pressure on the atomization of ethanol gasoline at different speeds. By analyzing the underexpansion of static pressure on both sides of the fluid,it is concluded that the under-expansion jet is conducive to the mixing of air and liquid fuel. The simulation results show that increasing the speed difference of gas-liquid mixture can improve the atomization degree of ethanol- gasoline at the outlet of the nozzle, which is beneficial to the full combustion.

关 键 词：火焰切割 气液两相流 Mixture模型 数值模拟 

分 类 号：TG481[金属学及工艺—焊接]