轴对称塞式喷管电磁散射特性数值模拟

Numerical Simulation of Radar Scattering Characteristics of Axisymmetric Plug Nozzle

为研究塞锥存在对喷管雷达隐身特性的影响,以涡扇发动机轴对称喷管为基础,设计了加有不同锥度塞锥的塞式喷管;运用自主开发的基于物理光学迭代(IPO)和等效边缘电磁流(EEC)方法的程序对各型塞式喷管的雷达散射特性进行了数值计算并与原轴对称喷管特性进行对比分析。结果表明:塞式喷管能够有效降低喷管雷达散射截面(RCS);但0°仰俯角附近会有局部升高,在水平极化和垂直极化方式下RCS值分别比原喷管最大增大8.14%,11.77%;存在最优锥度,在水平和垂直极化方式下都能够最大程度减小喷管总场RCS均值,使得其比原喷管分别减缩13.2%,15.2%。

To investigate the radar stealth characteristics of the nozzle with plug,based on the axisymmetric nozzle from a certain turbofan engine,a series of nozzles with plugs of different taper were studied in the current work. The radar scattering characteristics of the nozzles were calculated by a program developed from Iterative Physical Optics（IPO）and Equivalent Edge Current（EEC）. Compared with the baseline nozzle,except for the condition of zero degree elevation angles,in which the radar cross-section（RCS）increases by 8.14% and11.77% under the condition of horizontal and vertical polarization,respectively,the RCS with plugs decreases effectively. And with the plug of the optimal taper,the RCS of the nozzle can be decreased by 13.2% and 15.2%under the condition of horizontal and vertical polarization,respectively.