出口锯齿修形对轴对称喷管雷达散射截面的影响研究  

The Influence of Outlet Sawtooth Modification on RCS of Axisymmetric Nozzles

作　　者：王俊琦[1] 晁晓亮 高翔[1] 杨青真[2] 

机构地区：[1]中国飞行试验研究院发动机所,西安710089 [2]西北工业大学动力与能源学院,西安710072

出　　处：《科学技术与工程》2016年第15期301-306,共6页Science Technology and Engineering

摘　　要：为了研究出口边缘锯齿修形对轴对称喷管边缘绕射场和腔体内部散射场的影响,以轴对称喷管为基准模型,对其出口边缘进行8种不同齿角的锯齿修形,齿数均为12,采用迭代物理光学法和等效边缘电磁流法研究分析了基准喷管模型和8种出口锯齿修形喷管模型的边缘绕射场和腔体散射场的电磁散射特性。结果表明:对出口边缘进行锯齿修形可有效降低喷管全局探测角范围的绕射场雷达散射截面(RCS),且修齿齿角越小,效果越明显;但出口边缘锯齿修形对降低喷管腔体散射场RCS无明显作用。Based on a standard axisymmetric nozzle,eight nozzle models have been built with different sawtooth angles to investigate the effect of outlet sawtooth modification on the RCS（ radar cross section） of axisymmetric nozzles,each model has 12 tooth. Based on iterative physical optic（ IPO） approach and equivalent edge currents（ EEC） method,a program has been developed and used to simulate the radar scattering characteristics of the standard nozzle and eight modified nozzles. The results bring to some conclusion： the outlet sawtooth modification can effectively reduce the RCS of the diffraction field of the axisymmetric nozzle,and the smaller the sawtooth angle is,the smaller the RCS of the diffraction field in each detecting angles will be. But the sawtooth modification cannot reduce the RCS of the cavity.

关 键 词：轴对称喷管 锯齿修形 迭代物理光学法 等效边缘电磁流法 雷达散射截面(RCS) 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]