Nonlinear Aeroelasticity and Unsteady Aerodynamics

非线性空气弹性和非定常空气动力学

• 批准号: RGPIN-2018-04662
• 负责人: Poirel, Dominique
• 金额: $ 2.33万
• 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: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712607
• 关键词: Nonlinear; Aeroelasticity; Unsteady; Aerodynamics

The discipline of aeroelasticity is concerned with the interaction of a flexible structure and the fluid it is surrounded with. The flow around a structure induces forces on it. If the structure is flexible, it will deform in response to these loads and subsequently this deformation will modify the flow, and so on until some type of equilibrium state is achieved. An example is the vibrations of an aircraft wing as it enters a zone of atmospheric turbulence, or in response to a single gust. This is very similar to the fluttering motion of venitian blinds when a gust of wind occurs through a window. Many aspects of the aeroelastic motions are well known. Many others are, however, still problematic. For instance, sustained oscillations of a wing can occur, sometimes without apparent external cause. Other times, the cause is known but it is very difficult to model, hence to predict and control. These oscillations may have dramatic consequences on the performance and safety of the aircraft. Flying insects and birds are also experiencing fluid-elastic interactions due to their flexible wings. However, these interactions often have a positive impact on the ability of the animal to fly. Another benefit of these aeroelastic oscillations is their potential use for energy harvesting. This research aims at understanding these fluid-elastic interactions phenomena via a range of models, simple to more complex. It mainly focuses on low airspeed flight regimes, which are well suited to unmanned air vehicles (UAV), larger and very flexible high altitude long endurance (HALE) aircraft and wind/hydrodynamic energy harvesters.

气动弹性学科涉及柔性结构与其周围流体之间的相互作用。绕过建筑物的流动会对其产生作用力。如果结构是柔性的，它将在这些载荷作用下变形，随后这种变形将改变流动，依此类推，直到达到某种类型的平衡状态。一个例子是飞机机翼进入大气湍流区时的振动，或对单一阵风的响应。这与一阵风从窗户吹进来时，韦尼提安百叶窗的飘动非常相似。气动弹性运动的许多方面是众所周知的。然而，其他许多公司仍然存在问题。例如，机翼的持续摆动可能发生，有时没有明显的外部原因。其他时候，原因是已知的，但很难建模，因此无法预测和控制。这些振荡可能会对飞机的性能和安全产生戏剧性的后果。飞行的昆虫和鸟类由于其灵活的翅膀也经历了流体-弹性相互作用。然而，这些相互作用往往对动物的飞行能力产生积极影响。这些气动弹性振动的另一个好处是它们可能用于能量收集。这项研究旨在通过从简单到复杂的一系列模型来理解这些流体-弹性相互作用现象。它主要关注低速飞行模式，非常适合无人驾驶飞行器(UAV)、更大且非常灵活的高空长航时(HALE)飞机和风/水动力能量收集器。