底部形状对钝锥体模型气动与电磁散射性能的影响

开展了飞行器气动与隐身综合特性数值研究。分别利用时域有限差分法和数值求解N—S方程的方法对飞行器的电磁散射与气动特性进行了数值模拟，研究了钝锥体模型底部形状对其雷达散射截面（RCS）和零升阻力的影响。由数值计算结果可知：合理地改变钝锥体模型底部形状，可以降低模型的RCS。并且，随着椭球体轴的长度或锥体高度的增加，模型的RCS逐渐减小。当飞行马赫数为5．0，高度为20km时，底部形状为椭球体或锥体的模型，随着椭球体轴的长度或锥体高度的增加，模型的零升阻力略有下降。

Effect of the blunt-cone model＇s bottom shape on its aerodynamics/scattering performance

The vehicle＇s aerodynamics and scattering performance were researched by numerical solving the N-S equations method and finite difference time domain method （FDTD） respectively. The corresponding programs were compiled. By these programs, the effect of a scaling blunt-cone model＇ s bottom shape on its aerodynamics/electromagnetic was researched. Ellipsoidal bottom and pyramidal bottom were used to change the model＇ s aerodynamics and scattering performance. The numerical results showed that the monostatic RCS of this scaling blunt-cone model would be attenuated by properly changing its bottom shape. The resistance of this scaling blunt-cone model would be decreased slowly with the changing of the bottom shape at the Mach number of 5.0, altitude of 20km and the angle attack of 0°.