高效热扩展技术在干式T/R组件散热中的对比研究

T/R组件散热是有源相控阵雷达领域的重要课题,大功耗、高热流密度器件在冷板上会形成局部热障,产生扩展热阻。文中以干式风冷T/R组件散热为研究对象,采用三维数值模拟方法对铝冷板、金刚石/铜、热管及蒸汽腔等高效热扩展技术进行了对比研究,探讨了导热系数、冷板厚度、对流换热系数对扩展热阻的影响规律。结果表明,提高冷板的等效换热系数是减小扩展热阻、强化传热最有效的途径之一。同时合理优化冷板厚度及散热器对流换热系数能有效降低高热流密度器件的工作温度。

Comparison Research of High Efficiency Thermal Spreading Technology in Heat Dissipation of Dry-type T/R Module

Heat dissipation of T/R module is an important topic in the area of active phased array radar. High power and high heat flux electronics cause hot spots in cold plate, and thermal spreading resistance arises. In this paper, the heat dissipation of dry-type T/R module is analyzed. High efficiency thermal spreading tech- nology including aluminum cold plate, diamond/copper composite, heat pipe and vapor chamber are analyzed and compared using 3D numerical simulation method. The effects of thermal conduction coefficient, cold plate thickness and convection heat transfer coefficient on thermal spreading resistance are discussed. The results show that increasing equivalent thermal conduction coefficient of the cold plate is one of the most effective methods for thermal spreading resistance decreasing and heat transfer enhancement. At the same time, the op- erating temperature of the devices with high heat flux can be reduced effectively through the optimization of cold plate thickness and convection heat transfer coefficient.