论文标题
膜机翼的不稳定空气动力学理论
Unsteady aerodynamic theory for membrane wings
论文作者
论文摘要
我们通过分析研究膜空气装饰的动态响应，以二维无压流动中的任意，小振幅和弦运动和横向阵风为生。理论模型假设在恒定张力下的可扩展膜的线性变形，该膜在空气启动上与外部空气动力载荷耦合，并使用不稳定的薄空翼型理论。研究了结构和空气动力学膜的反应，以进行谐波振荡，瞬时攻击角，正弦横向阵风和尖锐的阵风的瞬时变化。这些情况的不稳定的升力响应分别为Theodorsen，Wagner，Sears和Küssner函数产生气体弹性延伸，分别为膜空气翼型提供了弹性弹性。这些扩展是首次结合膜流体结构的相互作用，以表达柔性弹能的不稳定升力响应。我们的结果表明，在不稳定的流动条件下，具有适当调整的支撑物适当调整的膜的膜空气层可能具有与刚性空气层相比的实质性空气动力益处。
We study analytically the dynamic response of membrane aerofoils subject to arbitrary, small-amplitude chord motions and transverse gusts in a two-dimensional inviscid incompressible flow. The theoretical model assumes linear deformations of an extensible membrane under constant tension, which are coupled aeroelastically to external aerodynamic loads using unsteady thin aerofoil theory. The structural and aerodynamic membrane responses are investigated for harmonic heave oscillations, an instantaneous change in angle of attack, sinusoidal transverse gusts, and a sharp-edged gust. The unsteady lift responses for these scenarios produce aeroelastic extensions to the Theodorsen, Wagner, Sears, and Küssner functions, respectively, for a membrane aerofoil. These extensions incorporate for the first time membrane fluid-structure interaction into the expressions for the unsteady lift response of a flexible aerofoil. Our results suggest that membrane aerofoils with appropriately tuned pretension could possess substantial aerodynamic benefits over rigid aerofoils in unsteady flow conditions.
