应用光学, 2019, 40(5): 923, 网络出版: 2019-05-01
Modeling and analysis of infrared radiation characteristics of transport aircraft skin
哈尔滨工业大学 能源科学与工程学院, 黑龙江 哈尔滨, 150001
为了研究了C-17运输机的红外辐射特性, 依据红外辐射的基本原理以及运输机的结构、材料等数据, 对飞机机体进行几何建模和网格划分, 通过流场仿真计算得到机体蒙皮的温度分布, 并结合表面的多重遮挡算法计算出不同马赫数、不同视线方向的飞机蒙皮在红外(8 μm~12 μm)波段的总辐射强度。结果表明, 方位角为0°时, 相对于0.5马赫, 1马赫飞行状态时, 红外辐射强度增加32%, 马赫数对红外辐射强度影响非常大, 气动加热为其辐射强度的主要贡献源。从正前方或正后方探测时, 红外辐射强度峰值随天顶角接近对称分布, 从侧方探测时, 红外辐射强度分布较为平均, 因此天顶角对红外辐射强度影响较小。
In order to study the infrared radiation characters of C-17 transport aircraft, the body of aircraft was modeled and meshed based on the principle of infrared radiation, the structure and material of transport aircraft. The temperature distribution of skin was obtained through simulation of the flow field. Combined with the multiple occlusion algorithm of the surface, the total radiation intensity of aircraft in the infrared band( 8 μm~12 μm) was calculated with different Mach numbers in different directions of sight. The result shows that when the azimuth is 0° and the speed of aircraft is 1 Mach number, the radiation intensity can increase by 32% compared with the speed of aircraft is 0.5 Mach numbers. In this view, the Mach number has a great effect on the infrared radiation intensity whose increasing main source is pneumatic heating. When detecting from the front or the back, the infrared radiation intensity peak is approximately symmetrically distributed with the zenith angle. When detecting from the side, the infrared radiation intensity distribution is relatively average. In addition, the zenith angle has little effect on the intensity of infrared radiation.