论文标题
柔性膜机翼的不稳定的气弹性表征和缩放关系
Unsteady aeroelastic characterization and scaling relations of flexible membrane wings
论文作者
论文摘要
我们提出了一项数值研究，以表征二维柔性机翼在高攻击中的非线性非稳态弹性相互作用。耦合流体芬式的机翼系统由基于完全耦合的Navier-Stokes和非线性结构方程的车身构造的变异气体弹性求解器求解。使用耦合的流体结构分析，本研究的目的是为柔性机翼在攻击角度和气动弹性数字的参数空间中的弹性弹性行为提供物理见解和相关性。建立空气动力性能的相图以获得最佳性能的包膜曲线并确定阻力变化的过渡线。系统检查了攻击角度和航空弹性数对航空弹性行为的影响。时间平均的膜变形与非量纲数，即所谓的Weber数字呈正相关。基于空气力量波动与惯性弹性波动之间的动态平衡提出了新的缩放关系。可以通过操纵膜振动，质量比，曲线数和气动弹性数来调整不稳定的空气动力。数值调查提供了设计指南，并有可能提高具有柔性机翼结构的微型空气车的机动性和飞行敏捷性。
We present a numerical study to characterize nonlinear unsteady aeroelastic interactions of two-dimensional flexible wings at high angles of attack. The coupled fluid-flexible wing system is solved by a body-fitted variational aeroelastic solver based on the fully-coupled Navier-Stokes and nonlinear structural equations. Using the coupled fluid-structure analysis, this study is aimed to provide physical insight and correlations for the aeroelastic behavior of flexible wings in the parameter space of the angle of attack and the aeroelastic number. The phase diagrams of the aerodynamic performance are established to obtain the envelope curves of the optimal performance and determine the transition line of the drag variation. The effects of the angle of attack and the aeroelastic number on the aeroelastic behaviors are systematically examined. The time-averaged membrane deformation is positively correlated with a non-dimensional number, the so-called Weber number. A new scaling relation is proposed based on the dynamic equilibrium between the aerodynamic force fluctuation and the combined inertia-elastic fluctuation. The unsteady aerodynamic force can be adjusted by manipulating the membrane vibration, the mass ratio, the Strouhal number and the aeroelastic number. The numerical investigations provide design guidelines and have the potential to enhance the maneuverability and flight agility of micro air vehicles with flexible wing structures.
