电大尺寸进气系统隐身与进气综合特性

Comprehensive stealth characteristics and intake of electric,large-size intake systems

针对电大尺寸进气系统屏蔽结构设计的复杂性,本文对电大尺寸进气系统的隐身性能和流动性能进行了综合研究。对一种新型百叶屏蔽结构参数化进行研究;基于射线追踪法,对进气舱室及屏蔽结构进行隐身性能的计算及分析;利用计算流体动力学,对进气屏蔽结构的流动性能进行计算及分析;基于正交实验、信噪比分析方法,对评估隐身性能的重要指标雷达散射截面积、评估流动性能的重要指标总压损失进行综合分析研究。结果表明:新型百叶屏蔽结构的安装可以有效提升进气系统的隐身性能。百叶安装角度为50°、百叶间距为50 mm、百叶板长为60 mm时所得到的结构是在保证优异的进气流动特性情况下所得到的最优雷达散射截面积特性结构。百叶角度对隐身性能以及流动性能的影响均为最大。数值仿真结果与实验吻合较好,本文分析方法及结果对进气系统综合设计提供理论设计基础。

Considering the design complexity of the shielding structure of electrical large-size intake systems,this paper investigates the stealth and flowing performances of electric large-size intake systems.A new louver-type shielding structure was parameterized in this work.The stealth performances of the intake cabin and shielding structure and the flowing performances of the intake shielding structure were calculated and analyzed using the ray tracing method and computational fluid dynamics,respectively.Furthermore,we comprehensively examined and analyzed the important indexes assessing stealth(i.e.,radar cross section(RCS))and flowing(i.e.,pitot loss)performances based on the orthogonal experiment and SNR(signal to noise ratio)analysis method.The results showed that the installation of a new louver-type shielding structure effectively improved the stealth performances of the intake system.The louver structure with an installation angle of 50°,shutter spacing of 50 mm,and shutter length of 60 mm produced the optimal RCS obtained under the premise of assuring excellent intake flow performances.In addition,the angle of the shutter was identified as the most influential factor affecting stealth and flowing performances.The numerical simulation results coincide well with the experiment.The analytic methods and results of the paper provide an important theoretical basis for the comprehensive design of intake systems.