飞翼布局飞行器电磁散射特性计算研究

飞翼布局是飞行器的重要形式,为研究飞翼布局的电磁散射特性,以美军典型飞翼飞行器B-2、、X-45C、X-47B、X-45A为基础,分别建立了四种不同外形布局特点的电磁分析模型A、B、C、D。基于物理光学法,数值模拟了不同威胁状态的RCS计算曲线,研究了各布局RCS曲线分布特点及其俯仰角、频率响应关系。计算结果表明,沿周向RCS分布与布局结构相关,俯仰角的较小变化对曲线分布形式和幅值影响不大;频率增加时RCS幅值减小,曲线向内收敛,震荡性增加;布局B隐身性能较好,头向30°角域RCS均值在15 GHz为-46.754 d Bsm;由于结构区别,布局C、D、A隐身性能依次降低;总体来看,飞翼布局有较好的隐身性能。

Study on Electromagnetic Scattering Characteristics of Flying-wing Aircraft

The flying-wing is an important layout of aircraft. In order to study the electromagnetic scattering characteristics of flying-wing aircraft, four kinds of electromagnetic models with different layout Characteristics A, B, C and D were established based on Based on the U.S. typical flying-wing aircraft B-2, X-45C, X-47B, and X-45A. RCS curves in different threat states were numerically simulated through Physical Optics method, and the distribution characteristics of RCS curves of various layouts and their relationship with pitch angles and frequencies were studied. The results show that the distribution of RCS in circumference is related to the aircraft layout. The small change of pitch angle has little effect on the distribution and amplitude of RCS curves. When the frequency increases, RCS amplitudes decrease, and curves converge inward and the concussions increase. The stealth performance of model B is better; its RCS arithmetic mean in angular domain of 30 degrees on nose direction is -46.754 dBsm at 15 GHz, and the stealth performance of layouts C, D and A decreases in turn due to difference in structure. Overall, the flying-wing layout has good stealth performance.