基于康达效应的电源箱体散热优化研究

Research on optimization of box heat dissipation based on Coanda effect

随着电力电子技术与集成电路的迅速发展,电源箱体结构变得紧凑复杂,而箱体散热成为亟需解决的问题。文章针对采取强迫风冷式散热的电源箱体,依据康达效应,结合变压器的几何结构修改了底部进风口形状,利用数值模拟的方法,分析了修改前后箱体内主要热源(变压器和IGBT模块)及整个箱体内部流场和温度场,并对比了优化效果。结果表明:改变底部进风口形状后,变压器和IGBT模块平均温度分别降低了约26.2和4.0 K;改变进风口形状,使变压器表面形成贴附射流,提高变压器表面的流速,进而增强了散热效果。

With the rapid development of power electronics and integrated circuits,the power supply case structure has become compact and complex,and the case heat dissipation has become an urgent problem to be solved.Based on the Coanda effect,the shape of the bottom air inlet is modified by combining the geometric structure of the transformer.Numerical simulation is applied to analyze the internal flow and temperature fields of the transformer,IGBT module and the whole box.The optimization results are compared and analyzed.The results show that after the modification of the air inlet,the average temperature of the transformer and IGBT module decreases by 26.2 K and 4.0 K,respectively.The air flow forms an adherent jet on the transformer surface,which increases the flow velocity on the transformer surface,thus enhancing the heat dissipation effect.