一种雷达导引头的隔热设计方法

A Thermal Insulation Design of Radar Seeker

针对雷达导引头外部气动加热温度高,内部组件集成度高的情况,提出了一种隔热设计方法。通过选用导热系数低的材料,设计气凝胶-空气双隔热层,有效地增加了传热路径的热阻系数;通过设计半圆定位装配法,将雷达主机与弹架之间以凸台环抱的方式实现点接触连接,大幅减小接触热桥面积。结合数模仿真和实物试验加以验证,在工作时间300 s内,环境初始温度为55℃,经过一段时间加热后,导引头外部温度达到450℃,内部的雷达主机的温度为79.5℃,满足导引头内部组件的工作环境要求。这种隔热设计方法有效地实现雷达导引头的热防护要求,并对小空间高模块密度设备的隔热设计起到一定的借鉴作用。

Aiming at the high aerodynamic heating outside and the high integration of internal components,a thermal insulation design method of the radar seeker is proposed.Selecting materials with low thermal conductivity and designing aerogel-air double insulation,the thermal resistance coefficient of the heat transfer path is effectively increased.Designing the semicircle positioning C,the radar and the frame are connected in points contact,which greatly reduces the contact area of thermal bridge.Combining digital-analog simulation and physical experiment to verify,within time 300 s,the initial environmental temperature is 55℃,the outer temperature of the seeker reaches 450℃,and the temperature of the internal radar is 79.5℃,which meets the working environment requirements of the seeker internal components.This thermal insulation design method effectively realizes the thermal protection requirements of the radar seeker,and plays a certain role as a reference for the thermal insulation design of high module-density equipment in small spaces.