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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684367
• 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.**

航空弹性的学科与柔性结构的相互作用及其包围的流体有关。围绕结构的流动会引起其上的力。如果结构灵活，它将因这些载荷而变形，随后，此变形将修改流量，依此类推，直到达到某种类型的平衡状态为止。一个例子是飞机机翼进入大气湍流区域或响应单一阵风时的振动。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。航空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，有时可能没有明显的外部原因发生机翼的持续振荡。其他时候，原因是已知的，但很难建模，因此很难预测和控制。这些振荡可能会对飞机的性能和安全产生巨大后果。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，这些相互作用通常会对动物飞行的能力产生积极影响。这些航空弹性振荡的另一个好处是它们的潜在用于能量收集。这项研究旨在通过一系列模型来理解这些流体弹性相互作用现象，这些模型更简单。它主要集中于低空飞行飞行方案，这些飞行方式非常适合无人驾驶汽车（UAV），更大且非常灵活的高海拔长耐力（Hale）飞机和风/流动能量收割机。**