飞翼无人机平面外形气动隐身优化设计

对一种双后掠飞翼布局隐身无人机(UAV)平面外形,基于参数化模型和网格自动划分技术,采用气动无黏/黏性数值求解模型和隐身工程评估方法结合单/多目标优化算法,在给定的变量设计空间中完成了气动隐身综合优化设计研究。通过多目标优化给出了布局气动升阻性能相对隐身性能的最优设计边界,指出了外形气动与隐身设计之间存在的冲突关系,即一方性能提升必会使另一方性能降低,不存在双方同时最优的解,飞翼外形设计时需要在气动与隐身间进行权衡折中。计算表明,在飞翼布局外形优化中应采用精度高的黏性气动计算模型。所建立的气动隐身一体化优化设计方法,为飞翼布局无人机外形精细设计奠定了基础。

Optimization design of aerodynamics and stealth for a flying-wing UAV planform

Aerodynamics and stealth design optimization for a cranked flying-wing Unmanned Aerial Vehicle (UAV)planform is conducted based on the parameterized model and automatic meshing technology combined with the uni-and multi-objective optimization algorithm.The aerodynamic performance is predicted by numerically solving inviscid/viscous models,and the stealth performance is estimated through engineering methods.The optimal design front is given by the multi-objective design optimization.The conflict relationship between the aerodynamic and stealthy characteristics is identified,showing that im-provement of Radar Cross Section (RCS)performance will lead to decrease of lift to drag ratio.This further indicates that the design of the flying-wing configuration needs consider the tradeoff between aerodynamics and stealth.Calculation shows that the viscous aerodynamic models should be used in the flying-wing design optimization.The design optimization method of aerodynamic-stealthy integration proposed can provide good foundation for the finer design of the flying-wing configuration of the UAV.