机载雷达舱瞬态温度场的数值模拟

Numerical simulation of transient temperature field in the airborne radar cabin

针对机载雷达舱瞬态温度场的分析与计算问题,引入壁面热流函数,简化了雷达舱外复杂的热边界条件,针对雷达舱内电子设备热物性参数的不确定性,提出了一种简化的工程计算方法.分析了雷达舱内辐射-导热-对流耦合换热作用,建立了雷达舱动态热平衡方程,在结合雷达舱环控系统的基础上,采用蒙特卡罗法求解舱内设备之间的辐射换热,采用热网络法求解雷达舱内的耦合换热,获得了雷达舱内的瞬态温度场,分析了不同初始状态及飞行工况对雷达舱瞬态温度场的影响,为机载雷达舱设计及相关研究提供了重要依据.

To analyze and calculate the transient temperature field in the airborne radar cabin, by introducing a wall heat flux function, the effects of aerodynamic heat transfer and thermal radiation outside the aircraft skin were transformed into a kind of flexible thermal boundary condition for the internal thermal analysis. A simplified engineering calculation method is brought forward for solving the uncertainty of thermal parameters of electronic equipments in radar cabin. The coupled heat transfer of conduction with radiation and convection was analyzed and the dynamic thermal balance equation of radar cabin was established. The thermal network method combined with the Monte Carlo method was used to solve the coupled heat transfer based on the combined environment control system. The transient temperature field of airborne radar cabin was simulated numerically. The research provides an important reference for the design of airborne radar cabin.