Sensitivity analysis and optimization design of high stealth flying wing layout airfoil
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摘要:
高隐身飞翼布局必须满足宽频段隐身设计要求，传统气动外形隐身设计主要面向高频光学区，针对谐振区翼型气动外形隐身设计的研究较少，无法为飞翼布局气动外形宽频隐身设计提供有效的指导。开展飞翼布局翼型宽频隐身设计研究，利用基本效应法开展了不同频段下翼型外形参数敏感性研究，发现高、低频段隐身设计与气动设计要求对翼型气动外形敏感性区域各不相同，不同频段隐身设计存在复杂的矛盾关系。在此基础上，提出飞翼布局宽频隐身设计模型，以NACA65,3-018翼型为基础开展考虑宽频隐身的气动优化设计。结果表明：所提模型可以提高飞翼布局翼型气动性能，同时实现宽频段高隐身特性。
Abstract:High-stealth flying wing layouts must meet the requirements of wideband stealth design. Traditional aerodynamic shape stealth design mainly targets the high-frequency optical range, and there is relatively little research on aerodynamic shape stealth design for wing profiles in the resonance range, making it incapable of providing effective guidance for wideband stealth design of flying wing aerodynamic shapes. To address these issues, research on wideband stealth design of wing layouts was conducted. Firstly, the basic effects method was used to study the sensitivity of wing profile parameters in different frequency bands, and it was found that the requirements for low-frequency stealth design and aerodynamic design have different sensitivity areas to the aerodynamic shape of the airfoil, and there are complex contradictions in stealth design in different frequency bands. This is the basis for a wideband stealth design model for wing layout, and NACA65,3-018 airfoils are used for aerodynamic optimization design that takes wideband stealth into account. The results show that the established wideband stealth design model can improve the aerodynamic performance of wing layout airfoils, simultaneously achieving wideband high stealth characteristics.
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图 2 FEKO与二维矩量法计算结果对比
Figure 2. Results comparison of FEKO and 2D moment method calculations
图 9 单点优化翼型RCS特性对比
Figure 9. Comparison of RCS performance of airfoils subjected to single-point optimization
图 11 多点优化翼型RCS特性对比
Figure 11. Comparison of RCS performance of airfoils subjected to multi-point optimization
图 12 气动隐身优化翼型外形对比
Figure 12. Comparison of aerodynamic and stealth optimized airfoil shapes
图 14 气动隐身优化翼型RCS特性对比
Figure 14. Comparison of RCS performance of airfoils from aerodynamio-stealth optimization
表 1 优化翼型特性
Table 1. Performance of optimized airfoil
外形 RCS/m f=300 MHz f=9 GHz NACA65,3-018 0.0449 0.0596 Opt_300 MHz 9 GHz 0.0402 0.0040 
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表 2 优化翼型特性
Table 2. Performance of optimized airfoil
外形 Cd Cm RCS/m f=300 MHz f=9 GHz NACA65,3-018 0.01141 −0.010 0.0449 0.0596 Opt_Aero/Stealth 0.00934 0.0301 0.0401 0.0086
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