中文摘要：

对LED照明系统常用的平行翅片型散热器进行翅片开缝改进,并采用计算流体动力学（CFD）方法模拟改进前、后LED阵列散热器在自然对流条件下的散热性能。计算结果表明,翅片开缝有利于形成自下而上的自然对流,从而达到消除局部环流和改善散热器自然对流换热性能的目的。在其他计算条件相同的情况下,翅片开缝使翅片的最高温度下降了约8℃,平均对流换热系数提高了67.5%。基于场协同原理的分析揭示,翅片开缝改善了速度场和热流场的协同性,在换热面积相同的条件下有效减小了散热器的热阻。

英文摘要：

Heat transfer intensification of high power LED radiator is of great significance to large-scale application of LED.Plate fin radiator,which has been widely used in LED lighting system,is improved by slotting in this study.Natural convection heat rejection of LED array was simulated by computational fluid dynamics（CFD） method before and after the structural modification.As shown by computational results,strip fin is propitious to forming bottom-up natural convection,thereby eliminating local circulation and improving heat transfer performance.Under the same computational condiction,strip fin help lower the highest temperature of radiator by about 8 ℃ and increase average heat transfer coefficient by 67.5%.Analysis based on field synergy principle indicates that strip fin has improved the synergy between velocity and heat vectors,and effectively decreased the heat resistance of radiator with same heat transfer area.