LED汽车前大灯散热器正交优化设计与分析

设计了一种LED汽车前大灯散热器结构,该结构主要由一条通风管和一台无叶风扇组成.在SolidWorks软件中建立该散热结构模型,并导入FloEFD软件进行散热仿真,得到LED结温温度为148℃.提出在通风管中填充矩形翅片和填充蜂窝结构两种改进方案.仿真结果表明,采用两种改进方案后LED汽车前大灯的结温温度分别下降至102.01℃和86.20℃.对填充蜂窝结构方案进行正交优化试验,分析得出影响该系统散热性能的因素依次为:蜂窝等效直径、蜂窝类型、填充长度、壁厚和通风管长度.按照该顺序优化参数值,得到最优散热结构.仿真结果表明,经过正交优化后,LED汽车前大灯的温度降为75.17℃,进一步提高了整体结构的散热性能.最后分析了该结构的基板温度与风速的关系,结果表明当风速低于5m/s时,温度随着风速的增大急剧降低,当风速高于5m/s时,温度下降趋势相对缓慢.

Orthogonal Optimization Design and Analysis of the LED Car Headlights

A type of LED automobile headlamp radiating structure was put forward,which was mainly composed of a ventilation pipe and a non-leaf fan.The corresponding model was generated in SolidWorks and the thermal condition was calculated with FloEFD thermal simulations.Results showed that the LED junction temperature was 148C,Adopting two improved schemes,which rectangular fins and the honeycomb structure were filled into ventilation pipe respectively,the junction temperature of LED headlamps decreased to 102.01C and 86.20C respectively.With the orthogonal experiment,the scheme of filling honeycomb structure indicated that the factors affecting the system heat dissipation performance were as follows:the cellular equivalent diameter,honeycomb type,filling length,wall thickness and ventilation tube length.Therefore,the optimal heat dissipation structure was obtained by the parameter value of this order.Simulation results showed that,after orthogonal optimization,the temperature of LED headlamps was reduced to 75.17C,which further improved the heat dissipation performance of the whole structure.Finally,the relationship between the wind speed and the thermal structure's substrate temperature was discussed.The result demonstrated that when the wind speed was lower than 5m/s,the temperature decreased sharply with the increase of wind speed,and when the wind speed was higher than 5m/s,the temperature descend trend was relatively slow.