变形飞机动态气动特性数值模拟研究

Numerical simulation of dynamic aerodynamic characteristics of a morphing aircraft

根据近年来国内外提出的折叠翼变形飞机方案,设计了一种折叠翼变形飞机的3D数模,利用作者发展的动态混合网格技术和非定常计算方法,对该折叠翼变形飞机机翼折叠和展开过程中的动态气动特性进行了数值模拟,并与准定常计算结果进行了对比分析。计算结果表明:机翼在展开/折叠的过程中,飞机的气动特性会发生剧烈变化,在变形飞行控制率设计时需要引起高度的重视。

In this paper, a morphing pseudo-steady aerodynamic characteristics aircraft is designed firstly based on the references, and the unsteady and are simulated numerically by a steady/unsteady flow solver based on the dynamic unstructured grids developed by the authors. The transonic inviscid flow is considered only in the simulations. The effect of folding and unfolding speed is studied and compared with each other. The numerical results show that the unsteady aerodynamic characteristics of the morphing aircraft change rapidly, because the shock wave on the upper surface of the morphing wing moves forward/backward during the process of wing folding/unfolding. Therefore, the design of the flight control law should be paid more attention for morphing aircrafts.