摘要
为有效抑制航空发动机外域雷达散射对发动机腔体内部雷达散射结果的影响,提高发动机后向腔体雷达散射截面测试精度,依据发动机结构构型和飞/发一体化布局特点,采用异型曲面设计方法开展基于4种发动机后向雷达散射截面积(RCS)测试的低散射载体外形设计及分析。完成标准低散射目标和4种发动机低散射载体雷达散射截面分布的数值仿真,并对枣核体及其配装发动机进行了RCS测试验证。结果表明:枣核体与水滴体均具有较好的低散射特性,枣核体更适用于轴对称喷管状态发动机进行界面处的一体化设计,并且枣核体及其配装发动机RCS测试得到在宽频段(L~Ku波段)、广角域内(±65°)的雷达散射截面较被测目标低2个数量级,界面处无明显散射,满足发动机雷达隐身的测试需求,可为中国发动机的RCS测试提供设计方法与参考。
To effectively suppress external radar scattering interference in engine rearward cavity RCS measurements and improve their accuracy,shape design and analysis of four low scattering shells were conducted using a freeform surface design method,tailored to engine structural configuration and the layout of airframe-engine integration.Numerical simulations were conducted to analyze the RCS distributions of the standard low-scattering target and four low-scattering shells.Among these,the spindle-shaped shell and its engineintegrated configuration underwent RCS measurement validation.The results show that both the spindle-shaped shell and the teardropshaped shell exhibit good low-scattering characteristics.The spindle-shaped shell is more suitable for integrated interface design of engines with axisymmetric nozzle,and the RCS of the engine with spindle-shaped shell is 2-order-of-magnitude lower than the target under test in wide bands(L to Ku-band)and wide-angle domain(±65°),with no significant junction scattering,which meets the requirements of engine RCS measurement and provides of a methodological reference for the design of low scattering shell shape for aeroengines rearward cavity RCS measurement of China.
作者
卢婷
李岳锋
李恒
王国洪
陈晨
马健
LU Ting;LI Yue-feng;LI Heng;WANG Guo-hong;CHEN Chen;MA Jian(AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China)
出处
《航空发动机》
北大核心
2025年第4期117-122,共6页
Aeroengine
基金
国家级研究项目资助。
作者简介
卢婷(1994),女,硕士,工程师。
