底部形状对钝锥体模型气动与电磁散射性能的影响  

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

作　　者：于哲峰[1] 黄谦[1] 张志成[1] 梁世昌[1] 简和祥[1] Yu, Zhe-Feng[1]; Huang, Qian[1]; Zhang, Zhi-Cheng[1]; Liang, Shi-Chang[1]; Jian, He-Xiang[1]

机构地区：[1]中国空气动力研究与发展中心,四川绵阳621000

出　　处：《实验流体力学》2009年第2期45-49,共5页Journal of Experiments in Fluid Mechanics

摘　　要：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。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°.

关 键 词：电磁散射 气动性能 时域有限差分法 N—S方程 钝锥体模型 

分 类 号：O441.4[理学—电磁学]