飞机红外辐射空间分布特性仿真研究

Simulation research on IR radiation space distribution characteristic of fight plane

为深入了解飞机在3~5μm波段红外辐射的空间分布特性,在建立飞机尾焰红外辐射的椭圆体模型后,利用飞机蒙皮红外辐射模型和尾喷口红外辐射模型,仿真计算了飞机在不同方向上3~5μm波段的红外辐射,给出了红外辐射的空间分布曲线。计算发现飞机的红外辐射关于机翼平面和机体纵向对称平面对称,在机尾和机头各有4个极值。其中在机尾辐射方向为(±150°,±32°)时红外辐射的极大值达到5 177 W,在机头辐射方向为(±68°,±64°)时红外辐射的极大值达到3 461 W。通过分析飞机红外辐射在机翼平面、机体纵向对称平面和极值平面的分布规律,发现在机头正向红外辐射非常小,但当辐射方向不在机轴正向时,随着辐射方向与机轴方向夹角的增大红外辐射急剧增加。还发现在机翼平面辐射方向投影与机轴夹角越小,在机体纵向对称面上红外辐射出现极值的方向越靠近机轴。同样在机体纵向对称面上辐射方向投影与机轴夹角越小,则在机翼平面上红外辐射出现极值的方向也越靠近机轴。

Considering the IR radiation space distribution research of fight plane is very little, in order to deeply understand IR radiation space distribution characteristics of fight plane in 3-5 μm, the infrared radiation ellipsoid model of tail flare is established, IR radiation characteristics of fight plane in different directions in 3-5 μm are simulated and calculated with the fight plane skin IR radiation model and the tail nozzle IR radiation model, and space distribution curves of IR radiation is given. The calculation shows that the infrared radiation of the aircraft is symmetrical with respect to the wing plane and the longitudinal symmetry plane of the fuselage. There are 4extremes each in the tail and nose. The maximum value of infrared radiation is 5 177 W when the radiation direction is( ±150°, ±32°) in the tail and the maximum value is 3 461 W when the radiation direction is( ±68°,±64°) in the nose. By analyzing the distribution rule of IR radiation of fight plane in the wing plane, the fuselage longitudinal symmetrical plane and the peak value plane, the IR radiation is very low when the radiation direction is positive direction of the plane axis, and the IR radiation grows rapidly when the angle between the radiation direction and the plane axis increases and the radiation direction is not positive direction of the plane axis. The research also shows the direction of peak value of IR radiation is closer to the plane axis in longitudinal symmetrical plane if the angle between the projection of radiation direction in wing plane and the plane axis becomes small. Similarly, the direction of peak value of IR radiation is closer to the plane axis in wing plane if the angle between the projection of radiation direction in longitudinal symmetrical plane and the plane axis becomes small.