Aeroelasticity and unsteady aerodynamics at low reynolds numbers

低雷诺数下的气动弹性和非定常空气动力学

• 批准号: 250022-2011
• 负责人: Poirel, Dominique
• 金额: $ 1.97万
• 依托单位: Royal Military College of Canada
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=524891
• 关键词: Aeroelasticity; unsteady; aerodynamics; low; reynolds

The discipline of aeroelasticity is concerned with the interaction of a flexible structure and its surrounding fluid. The flow around a structure will induce forces on it. If this structure is flexible, it will deform and subsequently modify the flow, and so on until some type of equilibrium state is achieved. A typical example is the vibrations of an aircraft wing as it enters a region of atmospheric turbulence. Many aspects of these aeroelastic motions are well known. Many others are, however, still problematic. For instance, sustained oscillations of a wing can occur, sometimes without any apparent external cause. This is very similar to the fluttering motion of venitian blinds when a gust of wind occurs through a window. Flying insects and birds are also experiencing fluid-elastic interactions due to their flexible wings. However and contrary to most human designs, these interactions often have a positive impact on the ability of the animal to fly. This research aims at understanding these fluid-elastic interactions phenomena via simple but representative models. It focuses on low airspeed flight regimes, which are well suited to unmanned air vehicles (UAV) and larger and very flexible high altitude long endurance (HALE) aircraft.

航空弹性的学科与柔性结构及其周围流体的相互作用有关。结构周围的流动将诱导其上方的力。如果该结构灵活，它将变形并随后修改流量，依此类推，直到达到某种类型的平衡状态为止。一个典型的例子是飞机机翼进入大气湍流区域时的振动。这些气动弹性运动的许多方面都是众所周知的。但是，许多其他人仍然有问题。例如，有时可能没有任何明显的外部原因，可能会发生机翼的持续振荡。这与当阵风通过窗户发生一阵风时，威尼特百叶窗的动作颤动非常相似。飞行的昆虫和鸟类由于其柔性翅膀而经历了流体弹性相互作用。但是，与大多数人类设计相反，这些相互作用通常会对动物飞行的能力产生积极影响。这项研究旨在通过简单但代表性的模型来理解这些流体弹性相互作用现象。它重点介绍了低空飞行的飞行方式，这些飞行方式非常适合无人驾驶汽车（UAV）以及更大且非常灵活的高海拔长耐力（Hale）飞机。