肋片截面及安装角度对LED散热性能的影响

Influence of the Cross-section Shape and Installation Angle of Fin on LED Heat Dissipation

摘要:

为提高LED的散热性能, 研究了肋片截面形状及安装角度对LED散热性能的影响, 获得了较优的肋片横截面形状和最佳肋片安装角度。首先, 利用Matlab软件对矩形截面和三角形截面进行数值计算, 选择具有较优截面形状的肋片制作3个实物模型;接着, 通过温度场测试实验, 对3种不同肋片安装角度的模型进行温度场分析, 比较并利用Ansys仿真反求出各个模型的表面对流换热系数, 进一步验证安装角度对LED散热性能的影响;最终获得较优的肋片截面形状为矩形, 最佳安装角度为90°(即垂直于水平面)。

Abstract:

The aim of this study is to investigate the influence of the relevant design parameters of fin on LED light, including cross-section shape and installation angle, so as to improve heat dissipation performance. Firstly, the thermal performance of two kinds of fins with different cross-section shape were simulated and compared using Matlab with the objective of searching for an optimal heat sink design. Then, three fin specimens with different fin angles were fabricated to conduct temperature test. Finally, Ansys was used to identify the convective heat transfer coefficient in this investigation. The results show that when the cross-section shape is rectangle and installation angle is 90°(perpendicular to the horizon), a minimum operating temperature can be obtained.