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结合射线追踪法的原理,利用自主开发的电磁散射特性计算程序,对具有不同尾缘修型的球面收敛调节片喷管进行了数值模拟计算,分别得到了不同喷管内部腔体散射场和喷管出口边缘绕射场的雷达散射截面积(RCS),并且通过计算获得了不同入射方位角上喷管腔体内壁面上的感应电流,通过对感应电流的分析,从本质上解释了RCS的变化规律.研究结果表明:对喷管出口尾缘所采用的修型措施在降低喷管出口边缘绕射场的RCS和改善喷管电磁隐身性能方面效果显著;相对于普通的遮挡算法,射线追踪法将计算周期缩短了21%以上,明显地提高了计算效率;利用感应电流的分析方法能够清晰直观地从本质上解释RCS的变化规律,并且具有较高的可靠性.
Combined with the principle of ray tracing method, a self-developed electromagnetic scattering characteristic calculation program was used to numerically simulate the nozzle of a spherical convergent adjusting piece with different trailing edge modification. The internal cavity scattering and jet Radar cross section (RCS) of the diffraction field at the exit edge of the tube is obtained. And the induced currents on the inner wall of the nozzle cavity at different incident azimuth angles are obtained. The analysis of the induced current basically explains the RCS change The results show that the repairing measures adopted at the exit of the nozzle are effective in reducing the RCS around the exit edge of the nozzle and improving the electromagnetic stealth performance of the nozzle. Compared with the conventional occlusion algorithm, the ray tracing method The calculation period is shortened by more than 21%, and the computational efficiency is obviously improved. The analysis method of induced current can clearly and intuitively explain the variation rule of RCS clearly and has high reliability.