双S弯排气系统雷达吸波涂层应用的仿真计算

Simulation of Radar Absorbing Coating Application for Double S-shaped Exhaust System

针对双S弯排气系统的雷达吸波涂层应用,采用弹跳射线法计算并分析了双S弯排气系统的散射源分布、涂覆雷达吸波涂层后雷达散射截面(RCS)缩减效果,以及雷达吸波涂层涂覆部位对双S弯喷管排气系统散射特性的影响。结果表明:典型双S弯排气系统的电磁散射特性存在明显的极化差异,其散射源主要分布在排气腔体终端结构、弯曲流道和喷管出口处,在相应部位涂覆雷达吸波涂层后在X波段、Ku波段的RCS减缩为78.0%、72.2%;在双S弯喷管排气系统中弯曲流道是强散射源之一且对总RCS贡献较大,在该位置涂覆雷达吸波涂层可有效降低排气系统的RCS;根据不同的涂覆方案,在X波段和Ku波段对应的RCS缩减分别为56.9%~78.0%、49.5%~72.2%。

To study the application of Radar Absorbing Coating(RAC)in a double S-shaped exhaust system,the distribution of scat⁃tering sources,the reduction in Radar Cross Section(RCS),and the influence of coating position on scattering properties were simulated and analyzed using the Shooting and Bouncing Rays(SBR)method.The results show significant polarization differences in the typical double S-shaped exhaust system,with the scattering sources mainly located in the terminal structure,the curved flow channel,and the nozzle outlet.After these parts are coated,the RCS reduction is 78.0%in the X-band and 72.2%in the Ku-band.The curved flow channel is one of the strong scattering sources,contributing significantly to the total RCS.The RCS of the exhaust system can be efficiently reduced by applying RAC at this position.Depending on the coating schemes,the RCS reductions are 56.9%~78.0%and 49.5%~72.2%in the Xband and Ku-band,respectively.