不同喷口修形的二元收敛喷管RCS数值模拟  

Numerical smulation of RCS for 2-D convergent nozzle with different trailing edges

作　　者：陈立海[1] 杨青真[1] 陈玲玲[1] 崔金辉[1] 

机构地区：[1]西北工业大学动力与能源学院,西安710072

出　　处：《航空动力学报》2012年第3期513-520,共8页Journal of Aerospace Power

摘　　要：用等效棱边电磁流(EEC)方法和物理光学迭代(IPO)法自主开发了计算程序,用来分析不同尾缘修形喷管的雷达散射特性;在计算中考虑喷管出口边缘的绕射场对雷达散射截面(RCS)的影响;提出了一种高效的判断面元间遮挡关系的算法和喷管出口轮廓线的辨别方法;在此基础上,研究了四种不同喷口修形的二元收敛喷管的RCS特性.结果表明:该开发程序具有较好的计算精度;适当的喷口修形可降低重点姿态角下喷管的RCS.Combining iterative physical optic （IPO） approach with equivalent edge cur- rents （EEC） method, a program which could calculate the edge diffraction field was devel- oped to simulate the radar scattering characteristics of nozzles with different trailing edges. An efficient algorithm to judge the occlusion relationship between face elements and a meth- od to judge the contour line of trailing edges were proposed. On this basis, RCS （radar cross section） characteristics of the two-dimensional （2-D） convergent nozzles with four kinds of trailing edges were investigated. The results show that the program developed is re- liable and the appropriate contour line modification of trailing edge can decrease the RCS of the nozzle in primary attitude angles.

关 键 词：二元喷管 雷达散射截面(RCS) 物理光学迭代(IPO)法 等效棱边电磁流(EEC)方法 射线追踪法 

分 类 号：V228.7[航空宇航科学与技术—飞行器设计]