摘要
基于飞翼无人机保形进气道尺寸要求,结合超椭圆方程,设计了前急后缓、缓急相当、前缓后急三种典型中心线和截面积规律的S弯进气道;采用多层快速多极子方法对直腔进气道进行了电磁仿真验证,对S弯进气道进行了隐身计算,并结合电流分布进行了机理分析。结果表明:进气道终端开放时,不同中心线和截面积的进气道隐身性能差异较小;截面积规律比中心线规律对进气道隐身性能影响更小;采用前急后缓的中心线和缓急相当的截面积规律能同时获得良好的气动和隐身性能。
Based on the conformal inlet＇s size requirement of flying wing unmanned aerial vehicle （UA V）, s-shaped inlets are designed with super-ellipse equation, and they are also designed in three typical centerline and area distributions of ＂beginning fast and end slow＂, ＂beginning and end the same＂, and ＂beginning slow and end fast＂. The numerical simulation is verified on electromagnetic scattering characteristics of the inlet with straight cavity based on multilevel fast multipole method （MLFMM）, and the stealth analysis is also carried out. And then the mechanism is analyzed combining with electric current distribution. Results indicate that with the inlet terminator open, there is little difference of the stealth characteristics on different centerline and area distributions; the centerline distribution exerts greater influence than the area distribution on the stealth characteristics of inlet; adopting the centerline distribution of ＂beginning fast and end slow＂ and area distribution of ＂beginning and end the same＂ in the s-shaoed inlet designs lead to both good aerodynamic and stealth performance.
作者
张乐
周洲
许晓平
Zhang Le;Zhou Zhou;Xu Xiaoping(Institute of Systems Engineering,CAEP,Mianyang 621900,China;College of Aeronautics,NWPU,Xi＇an 710072,China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2018年第8期2999-3006,共8页
Journal of System Simulation
基金
国家自然科学基金(11302178)
关键词
S弯进气道
中心线
截面积
隐身
电流分布
s-shaped inlet
centerline distribution
area distribution
stealth
electric current distribution
