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

Abstract:

In this paper,the transportation and atomization of phosphor glue flowing in high- power LED (LightEmitting Diode) phosphor coating process were investigated via CFD (Computational Fluid Dynamics) and numericalsimulations,and the 3D flow field models as well as the mathematical models of phosphor were established to de-scribe the velocity distribution of phosphor glue's flow field between two different spraying guns.Moreover,sprayingexperiments were carried out,and the consistency of simulated results with experimental ones was proved.It isfound that numerical simulation helps accurately predict the phosphor droplets trajectories and the velocity distribu-tion in LED phosphor coating process without establishing any models of atomization process; and that,within thesame spray distance,small phosphor droplet with high velocity may result in short acceleration and deceleration dis-tance.

Key words: high- power light emitting diode, atomized spraying, process modeling, numerical simulation, phos-phor droplets trajectory