发射率对飞机蒙皮温度及红外辐射特性的影响

Influence of surface emissivity on temperature and infrared radiation characteristics of aircraft skin

建立了某型飞机的简化几何模型,并设置了飞机的飞行航迹。综合考虑了太阳辐射、地球辐射、大气辐射和气动加热的多种因素,结合飞机蒙皮材料物理特性,针对涂覆三种不同发射率的隐身涂层蒙皮建立了导热物理模型,采用一维导热方程计算了飞机在12：00~12：45时间段飞行时不同发射率的蒙皮表面的温度分布。最后综合考虑了环境辐射的影响,分别对具有不同发射率的飞机蒙皮3~5μm和8~14μm两个波段的红外辐射强度进行了数值计算。结果表明：随着蒙皮发射率的减小,在一定程度上能降低蒙皮在8~14μm波段的红外辐射强度,但是因环境因素的影响,仅仅通过降低蒙皮发射率,飞机红外隐身的效果并不理想。

Predigesting geometrical model of a certain aircraft was established,and its flight path was set. Aerodynamic heating and radiation from sun,ground and atmosphere were considered comprehensively, then physical models of heat conduction were founded against three shielding coatings with different emissivity and physical characteristic of stealth aircraft skin.Based on one dimensional heat conduction equation,temperature distributions of skins with different emissivity were calculated between 12：00 pm and 12：45 pm.Finally,influence of environment radiation was considered,the infrared radiant intensity distributions of skins with different emissivity were calculated numerically in 3-5 μm and 8-14 μm.The result improves that with skin emissivity reducing the infrared radiant intensity of skin diminishes at a certain extent,but due to influence of environment radiation,the effect of aircraft infrared stealth is not ideal only by skin emissivity decreasing.