高压无气喷涂扇形喷嘴结构参数对内部流场影响的数值模拟  

作　　者：刘鑫[1] 汤晓华[1] 李擎远 

机构地区：[1]北京工商大学人工智能学院,北京100048

出　　处：《科技创新与应用》2023年第22期66-69,共4页Technology Innovation and Application

摘　　要：为研究高压无气喷涂中喷嘴内部结构参数对内部涂料流动状态的影响,在Fluent中对不同结构参数(收缩角,出口段长径比,出口切槽夹角)的喷嘴模型分别进行建模及数值模拟计算,黏性模型为层流模型,涂料为乳胶漆。仿真结果表明,在其他条件不变的情况下,喷嘴收缩角,出口段长径比,出口切槽夹角的改变都会对内部涂料的流动状态产生影响。随着喷嘴收缩角的增大,涂料流体的压力衰减和速度梯度也会明显加大;长径比的改变会影响流体的流速。切槽夹角对流体流速的影响较大,随着切槽夹角的增大,流体出口流速也会增加,但集束性会随之降低。In order to study the influence of the internal structural parameters of the nozzle on the internal coating flow state in high pressure airless spraying,the nozzle models with different structural parameters(shrinkage angle,outlet aspect ratio,exit notch angle)are modeled and numerically simulated in Fluent.The viscous model is laminar flow model and the coating is latex paint.The simulation results show that the nozzle shrinkage angle and outlet aspect ratio are constant under other conditions.The change of the notch angle at the outlet will have an impact on the flow state of the internal coating.With the increase of the nozzle shrinkage angle,the pressure attenuation and velocity gradient of the coating fluid will increase obviously.The change of the aspect ratio will affect the fluid velocity,and the notch angle has a great influence on the fluid velocity.With the increase of the notch angle,the fluid outlet velocity will increase,but the clustering will decrease.

关 键 词：高压无气喷涂 扇形喷嘴 内部流场 结构参数 数值模拟 

分 类 号：TQ639.3[化学工程—精细化工]