大功率LED荧光粉涂覆中流场分布的数值研究  

Numerical Investigation into Flow Field Distribution in High-Power LED Phosphor Coating Process

作　　者：郭琪伟[1] 胡跃明[1] 李致富[1] 

机构地区：[1]华南理工大学精密电子制造装备教育部工程研究中心∥自动化科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2014年第5期1-8,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家"863"计划项目(2012AA041312);广东省战略性新兴产业专项资金LED产业项目(2010A081002007)

摘　　要：采用计算流体动力学(CFD)与数值模拟方法研究大功率发光二极管(LED)荧光粉喷涂过程中荧光粉胶的流动传输和雾化过程,建立了三维荧光粉流场模型与数学模型,用于描述两种不同的喷涂枪外部荧光粉胶流场的速度分布,最后通过喷涂实验验证了仿真结果与实验结果的一致性.研究表明:在不建立雾化过程模型的情况下,采用数值模拟能准确预测LED荧光粉喷涂过程中荧光粉微滴的轨迹和速度分布;在相同喷涂距离内,荧光粉微滴直径越小、速度越快,小荧光粉微滴加速和减速的距离就更短.In this paper, the transportation and atomization of phosphor glue flowing in high-power LED （Light Emitting Diode） phosphor coating process were investigated via CFD （Computational Fluid Dynamics） and numerical simulations, and the 3D flow field models as well as the mathematical models of phosphor were established to describe the velocity distribution of phosphor glue＇s flow field between two different spraying guns. Moreover, spraying experiments were carried out, and the consistency of simulated results with experimental ones was proved. It is found that numerical simulation helps accurately predict the phosphor droplets trajectories and the velocity distribution in LED phosphor coating process without establishing any models of atomization process; and that, within the same spray distance, small phosphor droplet with high velocity may result in short acceleration and deceleration distance.

关 键 词：大功率发光二极管 雾化喷涂 过程建模 数值模拟 荧光粉微滴轨迹 

分 类 号：TN383[电子电信—物理电子学]