飞机整机蒙皮自身红外辐射特性建模与分析

Modeling and Analysis on Self-Infrared Radiation Characteristics of Whole Aircraft Skin

针对飞机整机蒙皮自身辐射特性计算的问题提出一个方法,通过对飞机三维图像建立网格、划分面元,对面元进行可视性判断及空间遮挡判断,建立求解飞机表面复杂几何外形的红外辐射模型。研究了发射率为0.7、0.8、0.9、1.0及马赫数为1.2、1.4、1.6条件下整机表面前向水平面和侧向垂直平面内的长波红外辐射强度分布,比较了飞机主要部件在观测方向上红外辐射强度所占的比重。结果表明蒙皮表面发射率与各观测方向的红外辐射强度在8～12μm波段内呈线性关系,飞行状态改变引起蒙皮温度的变化对红外辐射强度有明显影响。飞机各部件中,机身、垂尾、机头在前向观测方向上辐射强度占比重较大,机身、机翼、垂尾在正侧向观测方向上辐射强度占比重较大。计算结果对飞机红外隐身设计具有一定的指导意义。

This article presents a synthetic method for calculating the self-Infrared Radiation（IR） emitted from whole aircraft-skin.By building gridding and compartmentalizing surface on three-dimensional figure,an infrared signature model for solving the complex geometry and structure of a fighter is proposed with observability and shielding judging on surface element.The article contains calculation of the whole aircraft＇s horizontal and lateral long wave IR intensity with different Machs 1.2,1.4,1.6 and different emissivities 0.7,0.8,0.9,1.0;and the aircraft components that emit the most IR in observation angle are investigated.The results indicate a linear relationship between the skin emissivity and IR intensity in 8-12 mm band;skin temperature changing by aviate status alteration obviously influences IR intensity.When viewing from the front,there are fuselage,vertical stabilizer and head that contribute more to the IR intensity,and fuselage,wings,vertical stabilizer become the major source of IR in broadside view.The results provide useful reference in designing stealthy aircraft.