【摘要】 近些年,微小型飞行器(MAV)在各领域都有了快速的发展与应用。在大量的实际飞行测试中,微小型飞行器反映出侧向不稳定性,并会发生大幅度的滚转振荡,使得飞行器难以操控。这种不被期望看到的滚转不稳定性是当前微小型航空器设计所面临的主要挑战之一。本文对小展弦比低雷诺数机翼的流动特性进行了综述,并讨论小展弦比机翼的自诱导滚转现象,同时对自诱导滚转现象进行了定性与定量的描述与分析。此外,还介绍了各种流动控制方法,通过对前缘分离涡以及翼尖涡进行控制,实现对自诱导滚转的抑制。更多还原

【Abstract】 In recent years, Micro Aerial Vehicles(MAV) has developed and applied rapidly in various fields. In a large number of flight tests, lateral instability and large amplitude rolling oscillations of MAV have been reported, which makes its control difficultly. This undesired roll instability is one of the main challenges of current MAV design. The flow characteristics of low aspect ratio and low Reynolds number wings are reviewed, and the self-induced roll oscillations phenomenon of low aspect ratio wings is discussed. The self-induced roll oscillations phenomenon is described and analyzed qualitatively and quantitatively. Various flow control approaches are introduced to control the leading-edge separation vortex and wingtip vortex to suppress self-induced roll oscillations.更多还原