螺旋桨对无人作战飞机电磁散射特性影响

Influence of Propeller on Electromagnetic Scattering Characteristics for Unmanned Combat Aircraft Vehicle

为研究螺旋桨对无人作战飞机电磁散特性的影响,建立了某型无人机电磁散射分析模型,提出了分析螺旋桨电磁散射影响的RCS相对差值研究方法,采用物理光学法计算了不同频率、不同俯仰角下的RCS及相对差值。研究结果表明,螺旋桨引起RCS曲线向外膨胀,前、后向角域散射波峰幅值、宽度均增加;频率对RCS曲线影响较小,频率增加时前向、后向、周向RCS相对差值震荡性变大,前向30°角域达35.4493 dB;俯仰角增加时,螺旋桨模型RCS曲线向内收敛,螺旋桨对前向角域RCS相对差值影响较大,俯仰角0°时达28 dB左右,后向角域RCS相对差值随俯仰角振荡变化;螺旋桨在不同频率和俯仰角下均会明显增强电磁散射,是隐身设计的重要考虑因素。

In order to study the influence of propeller on electromagnetic scattering characteristics of unmanned combat aircraft vehicle,the electromagnetic scattering analysis model of a UAV is established,and the research methods of RCS relative value for analyzing the influence of propeller on electromagnetic scattering are proposed.By physical optics method,the RCS and relative value with different frequencies and pitch angles are calculated.The results show that the propeller causes RCS curves to expand outward,and the amplitude and width of scattering peaks increase in nose and rear direction.The effect of frequency on the RCS curves is little.The oscillation of RCS relative value in nose direction,rear direction and circumferential direction increases when the frequency increases,and the value reaches 35.4493 dB in 30°angular domain in nose direction.When the pitch angle increases,the RCS curves converge inward,and the propeller has a greater influence on RCS relative value of angular domains in nose direction,the value reaches about 28 dB in 0°pitch angle,and the value of angular domains in rear direction oscillates with the variation of pitch angle.The electromagnetic scattering is significantly enhanced by propeller at different frequencies and pitch angles,which will be an important consideration for stealth design.