基于Fluent的气液两相流喷嘴内部流动特性仿真  

Simulation of Internal Flow Characteristics of Gas Liquid Two Phase Flow Nozzle Based on Fluent

作　　者：邢炯 杨传民[1] 蔚俊 龚国腾 袁成志 何思念 XING Jiong;YANG Chuan-min;YU Jun;GONG Guo-teng;YUAN Cheng-zhi;HE Si-nian(Tianjin University of Commerce,Tianjin 300134,China;Hebei University of Technology Tianjin 300401,China)

机构地区：[1]天津商业大学,天津300134 [2]河北工业大学,天津300401

出　　处：《包装工程》2021年第9期207-214,共8页Packaging Engineering

基　　金：天津市自然科学基金重点项目(15JCZDJC34100)。

摘　　要：目的探究气液两相流喷嘴内部流动特性及工作参数对流动特性的影响。方法测量得到气液两相流喷嘴的结构图,利用Fluent软件建立喷嘴模型,并选择流体体积(VOF)两相流模型和RNG(重整化群)k-ԑ湍流模型,以常温状态下液态水和空气为研究介质,并以气压和液压为变量,进行多参数的流动特性分析,并引入气液比的概念。结果得到了不同时刻喷嘴内部的压力、速度及液相分布云图。其中最大压力为827 kPa,出现在出口段和进气段交叉的壁面上,由于喷嘴内部出现缩口,故出口段存在负压(−1.53 MPa);喷嘴内部最高速度出现在气液两相交汇处,为134 m/s;液相在最初迅速充满喷嘴后,逐渐与气相混合,最终出口段中心液相体积占比为0.543,混合情况良好。还得到了多参数对喷嘴内部压力、速度及液相分布的影响。结论使用软件仿真的方法得到了喷嘴内部的流动特性和多参数对流动特性的影响规律,并为进一步研究优化喷嘴结构及喷雾提供了建议和参考。This paper simulates a gas-assisted flow nozzle.First,establish a model of the nozzle,and select an appropriate calculation model according to actual working conditions.Liquid water and air at room temperature(25℃)are selected as the research medium.Using air pressure and hydraulic pressure as variables,the analysis of multi-parameter flow characteristics is studied,and the concept of gas-liquid ratio is introduced.After calculation,the static pressure,velocity and liquid phase distribution diagram inside the nozzle are obtained.The maximum pressure appears on the wall where the outlet part and the inlet part intersect.Due to the contraction inside the nozzle,negative pressure will be generated in the outlet part:the highest droplet inside the nozzle first appears at the nozzle,and then stabilizes at the intersection of the gas phase and the liquid phase;Finally,the largest droplet is produced at the nozzle.The liquid phase first fills the nozzle quickly and then gradually mixes with the gas phase.When the nozzle is sprayed,liquid water and air are evenly mixed.The influence of multiple parameters on the pressure,velocity and liquid phase distribution inside the nozzle is also obtained.The conclusion is that the Computational Fluid Dynamics method is used to obtain the internal state of the nozzle and the influence of multi-parameters on the flow characteristics,and to grasp certain laws,which provides help for further research and optimization of the nozzle structure and spray uniformity.

关 键 词：气液两相流喷嘴 数值模拟 流体体积 计算流体力学 

分 类 号：TB486[一般工业技术—包装工程] TH163[机械工程—机械制造及自动化]