双立尾对战斗机隐身特性的数值模拟

为了降低战斗机的雷达散射截面（RCS，Radar Cross Section）特性，研究了双立尾外倾对战斗机RCS特性的影响.对战斗机的三维数字样机进行网格划分，基于物理光学法数值模拟出双立尾向两侧对等偏转对三翼面战斗机的头向、侧向和尾向的RCS特性的影响，并对战斗机的缩比实体样机进行电磁测试，证明了方法的可行性和数值模拟的准确性.数值模拟结果表明，当双立尾从0°向外偏转10°时，三翼面战斗机侧向RCS值缩减至原来的 9.8%，而头向和尾向的RCS值变化幅度较小.

Numerical simulation on the stealth characteristics of twin-vertical-tails for fighter

In order to reduce the radar cross section (RCS) of fighter, the twin-vertical-tails effect on the RCS character of fighter was studied. The 3D digital fighter prototype was meshed. The RCS character effect of head, side and tail in three-surface fighter when twin-vertical-tails had a same deflection to two direction based on physical optics method was simulated. The electromagnetic testing on prototype fighter shrunk on a certain scale was made. The practicality of the physical optics method and the accuracy of numerical simulation were verified. The simulation results show that the side RCS of three-surface fighter reduced to 9.8% of what it had been, but the head and tail RCS had a little change when twin vertical fins deflected from 0° to 10°.