基于CFD无网格算法的飞行器电磁隐身特性模拟  

Simulation of Electromagnetic Stealth Characteristics of Aircrafts Based on Meshless Algorithm Referring from CFD

作　　者：高煜堃 陈红全[2] 王彪[1] 吴浩[1] 胡晓磊[1] 宋强强[1] GAO Yukun;CHEN Hongquan;WANG Biao;WU Hao;HU Xiaolci;SONG Qiangqiang(School of Mechanical Engineering,Anhui University of Technology,Ma＇anshan 243002,China;School of Aerospace Engineering,Nanjing University of Aeronautics and Astronautics,Nanj ing 210016,China)

机构地区：[1]安徽工业大学机械工程学院,安徽马鞍山243002 [2]南京航空航天大学航空宇航学院,江苏南京210016

出　　处：《安徽工业大学学报（自然科学版）》2018年第2期137-142,共6页Journal of Anhui University of Technology（Natural Science）

基　　金：国家自然科学基金项目(11172134);安徽省高校科学研究项目(KJ2018A0068);安徽工业大学青年科研基金资助项目(RD15200360)

摘　　要：为研究飞行器的电磁隐身特性,提出基于计算流体力学(CFD)的时域无网格算法。基于无网格点云结构,由展开的泰勒级数结合最小二乘技术逼近该算法涉及的空间导数;借鉴CFD的无网格方法,采用Steger-Warming通量分裂处理空间离散涉及的通量运算,采用四步Runge-Kutta格式推进求解时间离散,并运用该算法对电磁波从不同方向照射平板飞机模型的电磁散射场和双站雷达散射截面进行分析。结果表明:采用本文算法计算得到的二维圆柱双站雷达散射截面能与级数解吻合;该飞机模型的隐身特性与散射场的叠加作用及飞机外形等因素有关;本文算例在一定程度上验证了本文算法具有处理多体及多部件干扰等复杂情形的能力。In order to study the electromagnetic stealth characteristics of aircrafts, a meshless time-domain algorithm based on computational fluid dynamics （CFD） was proposed. Based on the meshless point cloud structure, the spatial derivatives related to the algorithm were approximated by using an expanded Taylor series combined with the least square technique in each cloud of points, and a Steger-Warming flux vector splitting approach was introduced from CFD for computing the physical flux of spatial discretization. After that, an explicit four-stage Runge-Kutta scheme was employed to develop the time discretization of the equations. Finally, the electromagnetic scattering field and the bistatic radar cross section of the electromagnetic wave irradiating the aircraft model with different directions were studied based on the algorithm. The results show that the calculated bistatic radar cross section for a 2D cylinder is in good agreement with that of the series solution; the electromagnetic stealth characteristics of the aircraft model is related to the superposition of scattering fields and its shape; the aircraft model example also shows that the algorithm presented has the ability to accommodate complicated situations with multielement or multi-component to a certain extent.

关 键 词：电磁隐身特性 时域无网格算法 计算流体力学 通量分裂 雷达散射截面 

分 类 号：V218[航空宇航科学与技术—航空宇航推进理论与工程]