论文标题
预压力弹性非线性aileron的空气动力响应
The aerodynamic response of a pre-stressed elastically nonlinear aileron
论文作者
论文摘要
我们研究了预压力弯曲的aileron的空气动力响应。虽然流体流量是标准的（无穷大的高雷诺空气流不受干扰），但该结构的设计为具有特殊的非线性行为。具体而言，当外力消失时，副翼仅具有一个稳定的平衡，但是当施加相关的空气动力载荷时，它是可动的。因此，对于足够高的流体速度，可能是另一个平衡分支。我们在风隧道中测试了这种副翼的原型。当流体速度超过临界阈值时，会观察到壳配置的突然更改（SNAP）：捕捉构型的特征是较低的阻力。但是，当速度降低到零时，结构会恢复其初始形状。类似的非线性行为可以为减少阻力策略具有重要的应用。
We study the aerodynamic response of a pre-stressed curved aileron. Whilst the fluid flow is standard (high Reynolds air flow undisturbed at infinity), the structure is designed to have a peculiar nonlinear behavior. Specifically, the aileron has only one stable equilibrium when the external forces are vanishing, but it is bistable when relevant aerodynamic loads are applied. Hence, for sufficiently high fluid velocities, another equilibrium branch is possible. We test a prototype of such an aileron in a wind tunnel; a sudden change (snap) of the shell configuration is observed when the fluid velocity exceeds a critical threshold: the snapped configuration is characterized by sensibly lower drag. However, when the velocity is reduced to zero, the structure recovers its initial shape. A similar nonlinear behavior can have important applications for drag reduction strategies.
