方形管道内无气离心喷涂涂料液滴流动特性的数值模拟  

Numerical Simulations of Hydrodynamics of Paint Droplet Using Airless Rotary Sprayer in Square Duct Coating Process

作　　者：李响 陈星 姜秀光 汪瞳 王昊旻 王睿 徐增辉 LI Xiang;CHEN Xing;JIANG Xiu-guang;WANG Tong;WANG Hao-min;WANG Rui;XU Zeng-hui(China Construction Power and Environment Engineering Co.,Ltd.;China Construction Eco-environmental Protection Technology Co.,Ltd.;China Construction Second Engineering Bureau Ltd.)

机构地区：[1]中建中环新能源有限公司 [2]中建中环生态环保科技有限公司 [3]中国建筑第二工程局有限公司

出　　处：《化工机械》2024年第4期580-589,共10页Chemical Engineering & Machinery

基　　金：中国建筑第二工程局有限公司科技研发项目(批准号:2021ZX180001)资助的课题。

摘　　要：采用Fluent-EDEM软件数值模拟了方形管道内无气离心喷涂涂料液滴流动过程。采用RNG k-ε模型模拟了方形管道内喷枪旋转引发的气体流动和JKR接触模型追踪涂料液滴的运动。采用堆积角虚拟仿真试验预测了涂料液滴与水平壁面接触表面能。数值模拟结果表明,随着喷枪旋转速度的增大,涂料液滴速度和碰撞作用力增大,沿方形管道壁面长度方向涂料液滴数呈现中部高、两端低的变化趋势。提出了基于沿壁面长度液滴数分布的无因次均匀度系数。研究结果表明,随着喷枪旋转速度的降低,液滴无因次均匀度系数减小;喷枪Ⅱ增加了射流小孔数,有助于降低壁面液滴无因次均匀度系数,改善液滴分布的均匀性。Having Fluent-EDEM software adopted to simulate the flow process of airless centrifugal spraying's paint droplets in a square pipe was implemented,including making use of the RNG k-8 model simulate the gas flow induced by the rotation of the spray gun in a square pipe and the JKR contact model employed to track movement of the paint droplets,and having virtual simulation test of accumulation angle used to predict the contact surface energy between the paint droplet and the horizontal wall.The numerical simulation results show that,with the increase of the rotation speed of the spray gun,the droplet velocity and collision force of the coating becomes increased,and the droplet number along the length of the square pipe wall gets higher in the middle and lower at both ends.In addition,a dimensionless uniformity coefficient based on the distribution of the number of droplets along the wall length was proposed.The results show that,the dimensionless uniformity coefficient of droplets decreases with the decrease of the rotation speed of the spray gun.The spray gun II can increase the number of small holes in the jet,which can reduce the dimensionless uniformity coefficient of droplets on the wall and improve the uniformity of droplet distribution.

关 键 词：方形管道 无气离心喷涂 JKR接触模型 RNGk-ε模型 无因次均匀度系数 

分 类 号：TQ055.81[化学工程]