吸波材料脱落对球面收敛喷管电磁散射特性的影响

在雷达吸波材料（RAM）涂覆位置影响球面收敛喷管（SCFN）雷达散射特性的结论上，研究了雷达吸波材料的脱落对SCFN雷达散射截面积（RCS）缩减效果的影响规律，采用加入阻抗边界条件的迭代物理光学（IPO）方法，计算了SCFN在5种不同脱落概率下的电磁散射特性。研究结果表明：吸波材料涂层的脱落会增加SCFN的RCS幅值；在俯仰探测面当脱落概率达到0.7时，依然能够保持68.19%的RCS缩减能力；在偏航探测面，当脱落概率达到0.5时，需要及时对吸波材料涂层进行修复。

Influence of RAM abscission on electromagnetic scattering characteristic of cavity

To research the influence of Radar Absorbing Material (RAM) abscission on the RCS reduction ability of Spherical Convergent Flap Nozzle (SCFN), the electromagnetic scattering characteristic of the nozzle under different abscission probability were studied by using the Iterative Physical Optical (IPO) with the impedance boundary condition based on the research on the coating medium at different parts. The research shows the value of the RCS of the SCFN would increase with the abscission probability increasing. The RAM which has not been fallen off can maintain 68.19% of the RCS reduction ability when the abscission probability reaches 0.7 in the pitch plane. While the RAM should be coated again when the abscission probability reaches 0.5 in the yaw plane.