弹性飞行器大机动飞行气动特性分析

针对两种不同气动布局的前、后掠翼无人机,采用CFD/CSD松耦合方法,对弹性飞行器承受过载为10和20情况下的气动特性与刚性飞行器进行了对比分析。计算结果表明,与刚性飞行器假设情况相比,考虑过载作用下的弹性前掠翼飞机升力减小、阻力减小;而弹性后掠翼飞机的升力增大、阻力增大;两种气动布局的弹性飞行器与刚性情况相比,升阻比都略微增大,而且俯仰力矩系数明显增大。这对于飞行器纵向气动操纵特性会产生较大影响,同时也说明在大机动飞行过程中计入飞行器的弹性变形是非常必要的。

Analysis of aerodynamics characteristic of elastic aerocraft in maneuvering flight

A CFD/CSD loosely-coupled methodology was employed in the analysis of nonlinear areoelastic behavior of two kinds of UAV in maneuvering flight.Using this approach,the forward-swept and backward-swept elastic aerocraft in the 10g and 20g g-load statuses were investigated and compared with the rigid body.The final result shows that when taking the elasticity into consideration the lift and drag of the forward-swept decrease,but for the backward-swept obviously increase,the lift-drag ratio for both configurati...