摘要
针对某型机载毫米波雷达天线热设计难题,提出了热管结合强迫风冷的新型冷却方式,设计了专用风道。应用数值模拟方法首先对T/R组件进行了热仿真计算,其次对天线背部风机抽风、吹风进行了仿真比较,再对散热翅片和风量分配进行了仿真优化,最后对3 km高空状态进行了仿真计算。计算结果表明,天线背部风机吹风明显好于抽风;翅片厚度0.8 mm,翅片数134,占空比23.8%的翅片结构散热较好;限流板阻力系数为5时风量分配较均匀;高空环境下满足天线工作要求。该方式合理可行,满足系统热设计要求,为同类产品的热设计提供了重要参考。
In order to solve the problem of thermal design on an airborne millimeter-wave radar antenna, a new cooling way which combines heat pipes with forced air convection is introduced, and special wind ducts are designed. Firstly, the T/R modules are simulated by numerical simulation methods. Secondly, the suction fan and the exhaust fan on the back of antenna are compared by simulation. Thirdly, fins and wind distribution are optimized by simulation. Finally, the cooling system is simulated at 3 km altitude. Simulation results show that exhaust fan is better than suction fan, heat dissipation effects are better when the fin thickness is 0.8 mm, the fin number is 134, and the ratio of thickness of fin to space of fins is 0. 238, wind distribution is better while the resistance coefficient of air restrictor plate is 5, the cooling way meets the antenna working requirement at high altitude. The cooling way is reasonable and meets the thermal design requirement, and provides an important reference for the thermal design of similar products.
出处
《电子机械工程》
2014年第3期16-18,26,共4页
Electro-Mechanical Engineering
关键词
毫米波雷达
天线
热设计
仿真
millimeter-wave radar
antenna
thermal design
simulation
