多区域自由变形技术在短舱安装位置减阻设计中的应用研究

Drag reduction design of install position of nacelle based on multi-zone FFD technology

  • 摘要: 为了进行短舱安装位置参数的减阻优化设计研究,首先在NURBS样条基函数的基础上建立了多区域自由变形(FFD)技术,通过对FFD控制体框架边界条件的合理选取建立组合框架,实现了多个控制框架对复杂外形不同区域的自由变形参数化,采用多个控制框架的空间控制体对某型客机短舱安装位置进行减阻优化设计。试验设计取样之后应用随机权重粒子群算法和Kriging代理模型建立气动外形优化系统,对某型客机短舱水平位置和水平安装角进行气动优化设计。优化设计结果表明,设计后的短舱位置使得整个飞机在一定攻角范围内的阻力显著减小,从而证明了基于多区域自由变形技术建立的优化设计系统是合理和实用的。

     

    Abstract: In order to conduct the drag reduction optimization design of install parameters of nacelle, multi-zone FFD technique is established based on NURBS (Non-Uniform Rational B-Spline) basis function in this paper. The composite frames are founded through choosing the boundary condition of FFD shape and lattice reasonably. Then, it can realize the FFD parameterized design of the multi-control frames for complex shape in different zones. This multi-control frame FFD technique is used to conduct drag reduction design of the install position of certain airliner nacelle. The aerodynamic optimization design system is established by combining FFD technique, random inertia weight PSO arithmetic and Kriging surrogate model. It process the aerodynamic optimization design by taking horizontal install position and horizontal torsion angle of certain airliner nacelle as design variables, and the results show that the optimized nacelle has lower drag and better aerodynamic characteristic in certain attack angle. Therefore, the optimization design system based on multi-zone FFD technique established in this paper is reasonable and practical.

     

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