基于计算电磁学方法的旋翼雷达散射截面特性

蒋相闻; 招启军

doi:10.13224/j.cnki.jasp.2014.08.020

基于计算电磁学方法的旋翼雷达散射截面特性

doi: 10.13224/j.cnki.jasp.2014.08.020

南京航空航天大学航空宇航学院直升机旋翼动力学国家级重点实验室, 南京 210016

基金项目:

江苏高校优势学科建设工程

详细信息

作者简介:
蒋相闻（1982-），男，安徽明光人，博士生，主要从事计算电磁学、直升机隐身设计和直升机计算流体力学研究。

中图分类号: V218
计量
- 文章访问数: 1063
- HTML浏览量: 1
- PDF量: 892
- 被引次数: 0
出版历程
- 收稿日期: 2013-04-28
- 刊出日期: 2014-08-28

Radar cross section characteristics of rotor based on computational electromagnetics method

National Key Laboratory of Rotorcraft Aeromechanics, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要

摘要: 以Maxwell方程组为主控方程，时间离散采用4步Runge-Kutta法，空间离散使用MUSCL（monotonic upstream-centered scheme for conversation laws）格式与Steger-Warming通量分裂结合的方法，建立了一套基于时域有限体积法的旋翼RCS（雷达散射截面）特性数值计算方法.采用代数方法生成围绕旋翼的O型贴体、正交网格.在验证方法有效性基础上，着重分析了旋翼平面和翼型RCS极化、入射角、电尺寸等影响特性，并给出了翼型几何特点对RCS的影响规律；然后运用线性加权和法进行了旋翼翼型隐身性能的综合筛选.研究表明：旋翼RCS动态包络线是一个强散射水平的连续振荡区域；选取3片桨叶旋翼的最大雷达探测距离为2片桨叶的82.2%，且有利于控制旋翼的散射最大峰值.同时，HH02旋翼翼型在4个重要的散射角域，最大探测距离分别为NACA0012翼型的105.1%，99.4%，86.6%和83.5%，表明综合雷达隐身性能最好.
- 武装直升机 /
- 旋翼 /
- 雷达散射截面 /
- 计算电磁学 /
- 翼型
Abstract: By taking Maxwell's equations as the governing equations, and employing four-stage Runge-Kutta method for the temporal discretization and Steger-Warming flux splitting scheme for the spatial discretization, the MUSCL(monotonic upstream-centered scheme for conversation laws) scheme was used to calculate the flux, and a numerical methodology for simulating the RCS(radar cross section) of rotor based on finite volume time domain method was developed. The O-type body fitted and orthogonal grid around rotor was generated using algebraic method. It has been demonstrated that the method is effective to simulate the RCS of the rotor. Firstly, calculations on RCS of rotor and airfoils about the polarization, angle of incidence and size have been conducted emphatically. Secondly, the influences of RCS on geometries of rotor airfoil have been investigated. Finally, the stealth of rotor airfoil has been obtained through linear weighted sum method. The results show that the RCS envelop of the rotor is represented by a continuous and oscillating area of strong scattering. The maximum radar detection range of the three blades rotor is 82.2% of the two blades rotor, helpful to control the maximum scattering peak. In four important scattering angle domains, the maximum radar detection ranges of HH02 rotor airfoil are 105.1%, 99.4%, 86.6% and 83.5% of NACA0012 airfoil, respectively, and the radar stealth performance of HH02 rotor airfoil is the best.
- armed helicopter /
- rotor /
- RCS(radar cross section) /
- computational electromagnetic /
- airfoil

HTML

参考文献(15)

[1]	张呈林,郭才根.直升机总体设计[M].北京: 国防工业出版社,2006.
[2]	Shankar V,Hill W,Mohammadian A H.A CFD-based finite-volume procedure for computational electromagnetic interdisciplinary applications of CFD methods[R].AIAA 89-1987-CP,1989.
[3]	Shang J S.Characteristic-based algorithms for solving the Maxwell equations in time domain[J].Antennas and Propagation,1995,37(3):15-25.
[4]	Camberos J A.COBRA-A FVTD code for electromagnetic scattering over complex shapes[R].AIAA-2002-1093,2002.
[5]	Camberos J A,Wheat P M,Wong S H.Development and status of a finite-volume,time-domain CEM research code with multidisciplinary applications[C]//2005 Users Group Conference.Nashville:IEEE Computer Society,2005:47-51.
[6]	Shi Y,Liang C H.The finite volume time domain algorithm using least square method in solving Maxwell equations[J].Journal of Computational Physics,2007,226(2):1444-1457.
[7]	Fumeaux C,Karan K,Vahldieck R.Spherical perfectly matched absorber for finite volume 3D domain truncation.[J].IEEE Transactions on Microwave Theory and Techniques,2007,55(12):2773-2781.
[8]	Camberos J A.A finite-volume time-domain CEM code for unstructured-grids on parallel computers[C]//Computational Electromagnetics in Time-Domain.Atlanta,USA:IEEE Microwave Theory and Techniques,2005:40-43.
[9]	Wang Z J,Prekwas A J.A FVTD electromagnetic solver using adaptive Cartesian grids[J].Journal of Computational Physics,2002,148(1):17-29.
[10]	Deore N,Chatterjee A.A cell-vertex finite volume time domain method for electromagnetic scattering[J].Progress in Electromagnetics Research:B,2010,12:1-15.
[11]	许勇,乐嘉陵.基于CFD的电磁散射数值模拟[J].空气动力学报,2004,22(2):185-189. XU Yong,LE Jialing.CFD-based numerical simulation of electromagnetic scattering[J].Acta Aerodynamica Sinica,2004,22(2):185-189.(in Chinese)
[12]	薛晓春,王雪华.用二维时域有限差分法计算机翼雷达散射截面[J].计算物理,2005,22(1):65-69. XUE Xiaochun,WANG Xuehua.Radar cross sections of airplane wings in the 2D FDTD method[J].Chinese Journal of Computational Physics,2005,22(1):65-69.(in Chinese)
[13]	Shang J S,Gaitonde D.Scattered electromagnetic field of a reentry vehicle[R].AIAA 94-0231,1994.
[14]	Hallerod T,Rylander T.Electric and magnetic losses modeled by a stable hybrid with explicit-implicit time-stepping for Maxwell's equations[J].Journal of Computational Physics,2008,227(9):4499-4511.
[15]	Chatterjee A,Myong R S.Efficient implementation of higher-order finite volume time domain method for electrically large scatterers[J].Progress in Electromagnetics Research:B,2009,17:233-254.