Application of ray-tracing method in calculating RCS for spherical convergent flap nozzle
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摘要: 结合射线追踪法的原理,利用自主开发的电磁散射特性计算程序,对具有不同尾缘修型的球面收敛调节片喷管进行了数值模拟计算,分别得到了不同喷管内部腔体散射场和喷管出口边缘绕射场的雷达散射截面积(RCS),并且通过计算获得了不同入射方位角上喷管腔体内壁面上的感应电流,通过对感应电流的分析,从本质上解释了RCS的变化规律.研究结果表明:对喷管出口尾缘所采用的修型措施在降低喷管出口边缘绕射场的RCS和改善喷管电磁隐身性能方面效果显著;相对于普通的遮挡算法,射线追踪法将计算周期缩短了21%以上,明显地提高了计算效率;利用感应电流的分析方法能够清晰直观地从本质上解释RCS的变化规律,并且具有较高的可靠性.Abstract: Numerical simulation of spherical convergent flap nozzles with different trailing edges shaping measures was finished using the self-developed electromagnetic scattering characteristic program based on the ray-tracing method. Radar cross section (RCS) of inner cavity scattering field and edge diffraction field was obtained for above several different SCFN. Meanwhile, induced electric current of inner cavity wall at different azimuth angles was calculated. With the method of analyzing the induced electric current, the change law of RCS was explained essentially. The analysis results show that the shaping measures for the trailing edge of the nozzle have a significant and obvious effect on decreasing the RCS of edge diffraction field and improving the electromagnetic stealth performance. Compared with ordinary occultation algorithm, the ray-tracing method shortens computational cycle by 21%, and improves the computing efficiency obviously. The analysis method using induced electric current can explain the change law of RCS clearly and intuitively with a high reliability.
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[1] 宋洁,王强.复杂形式球型收敛调节片喷管内流场计算及分析[J].航空动力学报,2007,22(8):1325-1329. SONG Jie,WANG Qiang.Numerical investigation on internal flow of a spherical convergent flap nozzle with complex geometry[J].Aerospace Power,2007,22(8):1325-1329.(in Chinese) [2] 梁春华,靳宝林,李雨桐.球面收敛调节片推力矢量喷管的发展[J].航空发动机,2002(3):55-58. LIANG Chunhua,JIN Baolin,LI Yutong.Development of spherical convergent flap nozzle[J].Journal of Aeroengine 2002(3):55-58.(in Chinese) [3] Daniel L C,Mary L M.Experimental investigation of spherical-convergent-flap thrust-vectoring two-dimensional plug nozzles[R].AIAA 93-2431,1993. [4] 赵景芸,金捷.推力矢量技术的研究与发展[J].燃气涡轮实验与研究,1999,12(1):51-54. [5] Brian E M,Malcolm K M.Scale model test results for several spherical/two-dimensional nozzle concepts[R].AIAA 93-2430,1993. [6] Taylor J G.Internal performance of a hybrid axisymmetric/nonaxisymmetric convergent divergent nozzle[R]. NASA TM-4230,1991. [7] Paul W H,Edward B T,Jim D S,et al.Yaw and pitch convergent-divergent thrust vectoringnozzle:US,4836451 [P].1989-06-06. [8] Syed S A,Erhart J J,King E W.Application of CFD to pitch/yaw thrust vectoring spherical convergent flap nozzles[R].AIAA 90-2023,1990. [9] 杨涛,杨青真,李岳锋.轴对称及二元喷管RCS的数值模拟研究[J].航空动力学报,2011,26(8):1819-1823. YANG Tao,YANG Qingzhen,LI Yuefeng.Numerical simulation of RCS for axisymmetric nozzles and symmetrical two-dimensional nozzle[J].Journal of Aerospace Power,2011,26(8):1819-1823.(in Chinese) [10] 阮颖铮.雷达截面与隐身技术[M].北京:国防工业出版社,1998. [11] David J W.Static thrust and vectoring performance of a spherical convergent flap nozzle with a nonrectangular divergent duct[R].NASA/TP-1998-206912,1998. [12] Arnon S,Rotman S R,Kopeika N S.Bandwidth maximization for satellite laser communication[J].IEEE Transactions on Aerospace and Electronic Systems,1999,35(2):675-682. [13] 陈立海,杨青真,陈玲玲,等.不同喷口修型的二元收敛喷管RCS数值模拟研究[J].航空动力学报,2012,27(3):513-520. CHEN Lihai,YANG Qingzhen,CHEN Lingling,et al.Numerical smulation of RCS for 2-D convergent nozzle with different trailing edges[J].Journal of Aerospace Power,2012,27(3):513-520.(in Chinese) [14] 崔金辉,杨青真,陈立海.球面收敛调节片喷管RCS数值模拟研究[J].航空发动机,2012,38(2):46-50. CUI Jinhui,YANG Qingzhen,CHEN Lihai.Numerical simulation of RCS for spherical convergent flap nozzle[J].Journal of Aeroengine,2012,38(2):46-50.(in Chinese) [15] 杨涛.飞行器动力系统腔体RCS数值模拟研究[D].西安:西北工业大学,2011. YANG Tao.Simulation of the radar cross section for cavities in aircraft power system[D].Xi'an:Northwestern Polytechnical University,2011.(in Chinese) [16] 许小艳.开口腔体的RCS计算[D].西安:西安电子科技大学,2007. XU Xiaoyan.Calculation of the radar cross section for open-ended cavities[D].Xi'an:Xidian University,2007.(in Chinese) [17] 李争亭,胡毕富,席平.腔体RCS计算前置处理中网格单 元的相互遮挡判断[J].工程图学学报,2008,29(1):61-66. LI Zhengting,HU Bifu,XI Ping.Mutual occlusion evaluation of duct mesh elements in processing of RCS calculation[J].Journal of Engineering Graphics,2008,29(1):61-66.(in Chinese) [18] 姬金祖,刘战合.基于面元分组的电磁遮挡算法及其优化[J].北京航空航天大学学报,2009,35(4):453-456. JI Jinzu,LIU Zhanhe.Electromagnetic occulation algorithm based on facets grouping and optimization[J].Journal of Beijing University of Aeronautics and Astronautics,2009,35(4):453-456.(in Chinese) [19] Milton L,John G T,Mark C F.Static internal performance of a two-dimensional convergent-divergent nozzle with external shelf[R].NASA Technical Memorandum 4719,1996. [20] Fernando O B,Jose L R,Burkholder R J.An iterative physical optics approach for analyzing the electromagnetic scattering by large open-ended cavities[J].IEEE Transactions on Antennas and Propagation,1995,43(4):356-361. [21] Burkholder R J,Lundin T.Forward-backward iterative physical optics algorithm for computing the RCS of open-ended cavities[J].IEEE Transactions on Antennas and Propagation,2005,53(5):793-799. [22] Michaeli A.Elimination of infinities in equivalent edge currents:Part I fringe current components[J].IEEE Transactions on Antennas and Propagation,1986,34(7):912-918. [23] Michaeli A.Equivalent edge currents for arbitrary aspects of observation[J].IEEE Transactions on Antennas and Propagation,1984,32(3):252-258. [24] 顾长青,舒永泽,徐金平.物理光学迭代法的子域连接法[J].电子学报,2001,29(3):420-422. GU Changqing,SHU Yongze,XU Jinping.A subdomains splicing technique for IPO approach[J].Acta Electronica Sinica,2001,29(3):420-422.(in Chinese) [25] 崔金辉.球面收敛段轴对称/二元矢量喷管设计优化及数值模拟研究[D].西安:西北工业大学,2012. CUI Jinhui.Numerical simulation and optimization design of spherical convergent flap axisymmetric/2-D vectoring nozzles[D].Xi'an:Northwestern Polytechnical University,2012.(in Chinese)
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