中心雾化孔压力对成膜特性的影响
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摘要
研究空气喷涂过程中中心雾化孔压力变化对喷雾流场和涂层厚度分布的影响。针对计算流体动力学中欧拉-拉格朗日方法建模的不足,采用欧拉-欧拉法建立中心雾化孔压力影响模型,对喷涂过程和成膜情况进行仿真计算,对比分析不同中心雾化孔压力下的喷雾流场和涂层厚度分布情况,并利用实验进行验证。结果表明:当中心雾化孔压力逐渐增大时,喷雾流场长轴喷幅变小,短轴喷幅逐渐增大,长短轴喷幅差距逐渐缩小直至近似;喷雾图形形状由椭圆形逐渐趋于圆形,成膜面积趋于稳定;涂层中心厚度显著增大,厚度分布趋于不均匀。
The work aims to study the influence of the central atomizing hole pressure changes on the spray flow field and coating thickness during air spraying process. In order to avoid the disadvantages of the Euler-Lagrange method,the Euler-Euler method was adopted to establish the influence model of the central atomizing hole pressure,which includes a paint spray model and an impinging and sticking model. Painting process was simulated by using this model. The paint spray flow fields and paint thickness distribution were obtained and compared,and experiments were conducted to verify the simulation results. Conclusion: When the central atomizing hole pressure increases,the major axis length of the spray flow field becomes smaller,the minor axis length gradually increases,the gap between the long and short axis is gradually narrowed until it is unchanged,the shape of the spray pattern gradually tends to the circle,the central paint thickness increases significantly and the thickness distribution tends to be uneven.
The work aims to study the influence of the central atomizing hole pressure changes on the spray flow field and coating thickness during air spraying process. In order to avoid the disadvantages of the Euler-Lagrange method,the Euler-Euler method was adopted to establish the influence model of the central atomizing hole pressure,which includes a paint spray model and an impinging and sticking model. Painting process was simulated by using this model. The paint spray flow fields and paint thickness distribution were obtained and compared,and experiments were conducted to verify the simulation results. Conclusion: When the central atomizing hole pressure increases,the major axis length of the spray flow field becomes smaller,the minor axis length gradually increases,the gap between the long and short axis is gradually narrowed until it is unchanged,the shape of the spray pattern gradually tends to the circle,the central paint thickness increases significantly and the thickness distribution tends to be uneven.
引文
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[2]CHEN W,CHEN Y,LI B,et al.Design of Redundant Robot Painting System for Long Non-regular Duct[J].Industrial Robot,2015,43(1):58-64.
[3]王国磊,陈恳,陈雁,等.变参数下的空气喷枪涂层厚度分布建模[J].吉林大学学报(工学版),2012,42(1):188-192.
[4]DOMNICK J,SCHEIBE A,YE Q.Unsteady Simulation of the Painting Process with High Speed Rotary Bells[Z].2009.
[5]CONNER D C,GREENFIELD A,ATKAR P,et al.Paint Deposition Modeling for Trajectory Planning on Automotive Surfaces[J].IEEE Transactions on Automation Science&Engineering,2005,2(4):381-392.
[6]陈雁,颜华,王力强,等.机器人匀速喷涂涂层均匀性分析[J].清华大学学报(自然科学版),2010(8):1210-1213.
[7]冯浩,吴秋,王小平.基于椭圆双β模型的球面喷涂轨迹优化[J].机械设计与制造,2016(4):249-252.
[8]刘亚举,龚俊,张鹏,等.倾斜喷涂圆弧喷枪新模型的建立与轨迹优化[J].机床与液压,2016,44(17):20-23.
[9]赖晨光,陈永燕,王媛,等.某柴油发动机缸内燃烧的数值模拟及优化分析[J].重庆理工大学学报(自然科学),2017,31(6):23-30.
[10]陈雁,陈文卓,何少炜,等.圆弧面空气喷涂的喷雾流场特性[J].中国表面工程,2017(6):122-131.
[11]刘国雄.空气雾化涂料喷枪喷涂流场仿真及特性研究[D].杭州:浙江大学,2012:31-49.
[12]FOGLIATI M,FONTANA D,GARBERO M,et al.CFD Simulation of Paint Deposition in an Air Spray Process[J].Journal of Coating Technology and Research,2006,3(2):117-125.
[13]YE Q,SHEN B,TIEDJE O,et al.Numerical and Experimental Study of Spray Coating Using Air-assisted High Pressure Atomizers[J].Atomization&Sprays,2015,25(8):323-328.
[14]YE Q,PULLI K.Numerical and Experimental Investigation on the Spray Coating Process Using a Pneumatic Atomizer:Influences of Operating Conditions and Target Geometries[J].Coatings,2017,7(1):13.
[15]OSMAN H,ADAMIAK K,CASTLE P,et al.Comparison between the Numerical and Experimental Deposition Patterns for an Electrostatic Rotary Bell Sprayer[C]//Proceedings of the 2015 International Mechanical Engineering Congress&Exposition.Houston,Texas,USA:[s.n.],2015:1-8.
[16]TOLJIC N,ADAMIAK K,CASTLE G,et al.A Full 3D Numerical Model of the Industrial Electrostatic Coating Process for Moving Targets[J].Journal of Electrostatics,2013,71(3):299-304.