雷达电子设备通风口结构对风机性能的影响

文中以某机载雷达电子设备机箱为研究对象，采用Icepak热仿真软件，研究了通风口的面积和长宽比的变化对机箱内强迫风冷散热系统性能的影响。结果表明：在风机型号和机箱内部结构一定时，相比于风机的总通风面积，当通风口的面积过小时，风机的性能较差；随着通风口面积的增加，风机的风量增加，风阻降低；当通风口的面积接近或大于风机的总通风面积时，风机风量较大，再继续增加通风口面积，风机的风量没有明显增加；当通风口长宽比过小时，风机的风量会降低，风阻会增加；当通风口的开口结构与风机的排布方式一致时，风机的性能最佳。

Effect of Intake Structure of Radar Electronic Equipment on Fan Performance

In this paper the effect of the intake area and length-width ratio on the performance of the forced air cooling system in the airborne radar electronic equipment is researched by the thermal simulation software Icepak. The results show that with the fixed fan model and unit internal structure, when the intake area is too small (compared with the total ventilation area of the fan), the performance of the fan is poor; that the wind resistance decreases and the wind of the fan increases with the increase of the intake area; that the wind of the fan is large when the intake area is close to or larger than the total ventilation area of the fan, but it will not obviously increase when the intake area continues to increase; that the wind of the fan will decrease and the wind resistance will increase when the length-width ratio of the intake is too small; that the fan performance is the best when the structure of the intake is accordant with the arrangement mode of the fan.