某航空发动机舱电子设备热设计

为了满足航空发动机舱电子设备热防护和热管理系统设计需要,本文对发动机舱内部热量产生和传递过程进行分析,得出了电子设备达到热平衡时的平衡方程,给出了与电子设备相关各部分热量的计算方法,建立了发动机舱电子设备传热计算模型。针对某航空发动机和电子设备的具体参数和工况,利用建立的传热模型进行迭代求解和分析。结果表明：与发动机舱空气温度相比,发动机机匣温度对于传入电子设备内部的热量值影响较大。隔热材料表面发射率越高,隔热材料表面的平衡温度也越高,传入电子设备内部的热量越多。

Study on Thermal Design of an Electronic Equipment in Aircraft Engine Nacelle

In order to meet the design demand of the thermal protection and thermal management system for electronic equipment in aircraft engine nacelle, in this paper, the heat generation and transmission process inside the engine nacelle was analyzed, the equilibrium equation was obtained, the heat calculate methods of the relevant parts related to electronic equipment was proposed, and the heat transfer calculation model of electronic equipment in engine nacelle was established. Using this calculation model, the steady thermal transmission of an electronic equipment in aircraft engine nacelle under typical working conditions was analyzed by iterative computing. The results shows that, comparing with the temperature of air in engine nacelle, the temperature of engine casing has a greater influence on the heat transmitted into the electronic equipment. The results shows that the higher the surface emissivity of the insulating material, the higher the equilibrium temperature of the surface of the insulating material, and the more heat will be transferred into the interior of the electronic equipment.