介绍了某雷达大功率固态发射机的结构布局及散热设计,并给出了关键部件的焊接及加工工艺方法。根据功放组件、供电电源及微波合成波导的热耗大小及分布形式,确定了整机液冷散热的热控方式,并进行了散热仿真分析。首先,基于热平衡方程计算得到单独模块散热所需的冷却液流量,并据此对冷板结构进行优化设计;然后,将各自冷板等效为独立的二端口流阻器件,在Flomaster 中建立整个热控系统的一维流体分配模型,得到分流板的关键结构设计变量;最后,通过FloEFD 软件并结合工程实际对整机进行散热仿真分析,得到发射机各器件及组合的表面温度分布云图。结果表明,功放组件芯片的最高温度及温度一致性均满足使用要求,从而验证了整机结构和散热方案的可行性。

The structural configuration and thermal design of the high-power solid-state transmitter of a radar are introduced, and the welding technology and machining methods are also presented in this paper. Based on the power dissipation and layout of power amplifier components, power supplies and microwave-synthetic waveguides, the liquid-cooling methods and heating simulation are determined and performed. Firstly, the coolant flows of single modules are worked out based on heat balance equation, and then the structural optimization design are performed. Subsequently, the key structural parameters of spreader plates are achieved based on that the cold-plates are equivalent to two-port flow resistance device in the Flomaster software. Finally, detailed parametric simulations are performed with FloEFD combined with engineering practice, and then the temperature on the surface of device and modules are also achieved. The results clearly demonstrate that both the highest temperature and temperature consistency of chips meet the use requirements. Accordingly, it is proved that the overall structure and cooling solution are possible.

TN957.3；TK124

陕西省秦创原“科学家+工程师”队伍建设资助项目(2022KXJ-030)