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在S形二元收敛喷管进出口面积、偏心距、面积变化规律及中心线变化规律不变的条件下,采用自适应超椭圆方法设计不同出口宽高比的S形二元收敛喷管.基于迭代物理光学法与等效边缘电磁流法自主开发计算腔体部件雷达散射截面(RCS)的程序;然后通过文献中的实验数据验证了计算程序的准确性和可靠性.通过计算程序分别分析了水平、垂直两种极化方式下不同S形二元收敛喷管的边缘绕射场与总散射场的电磁散射特性.结果表明:在水平、垂直两种极化方式下,喷管出口宽高比的变化对S形二元收敛喷管边缘绕射场的RCS影响较小,不同出口宽高比的S形二元收敛喷管边缘绕射场的RCS相差不超过4dB.喷管出口宽高比的变化对总散射场的RCS影响较大;正探测角时,宽高比为1.5时,在大部分探测角范围内总散射场有较低的RCS;负探测角时,宽高比为3.5时有较低的RCS.
Under the conditions of the inlet and outlet area, eccentricity, area change and centerline variation of S-shaped binary convergent nozzle, S-shaped binary convergent nozzle with different exit aspect ratio was designed by adaptive hyperelliptical method. Based on the iterative physical optics method and the equivalent edge electromagnetic flow method, a program to calculate the radar cross section (RCS) of cavity components is developed independently. Then the accuracy and reliability of the calculation program are verified by the experimental data in the literature. The results show that under the horizontal and vertical polarization modes, the nozzle exit width is larger than that of the general S-shape two-nozzle convergent nozzle in both horizontal and vertical polarization modes The variation of RCS has little effect on the RCS of the edge diffraction field of the S-shaped binary convergence nozzle, and the difference of RCS of the edge diffraction field of the S-shaped binary convergence nozzle with different outlet aspect ratio does not exceed 4dB. When the aspect ratio is 1.5, the total scattering field has a lower RCS in most of the detection angles. For negative detection angles, the aspect ratio There is a lower RCS at 3.5.