arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.07028physics.flu-dyn
收藏

非均匀柔性机翼中增强的飞行性能

Enhanced flight performance in non-uniformly flexible wings

Lionel Vincent, Min Zheng, John H. Costello, Eva Kanso

摘要:

生物推进器的灵活性,如翅膀和鳍,被认为有助于飞行和游泳的动物比他们的工程同行更高的性能。柔韧性似乎遵循一个通用的设计规则,即在推进器跨度远端的三分之一处产生弯曲模式。然而,形成这种收敛设计的空气动力学机制和性能的潜在改进还没有得到很好的理解。本文分析了非均匀柔度对滚转机翼飞行性能的影响。通过实验、数值模拟和比例分析,我们证明了遵循这一经验规则的展向叶尖柔性可以改善飞行性能。我们的研究结果将这种改善归因于颤振引起的阻力减小。这种机制是独立的机翼的自转,并代表了一个更普遍的特点,机翼与非均匀的尖端灵活性。最后,我们分析了展向和弦向非均匀性对翻滚荚舱飞行性能的影响。

英文摘要:

The flexibility of biological propulsors such as wings and fins is believed to contribute to the higher performance of flying and swimming animals compared with their engineered peers. Flexibility seems to follow a universal design rule that induces bending patterns at about one-third from the distal tip of the propulsor's span. However, the aerodynamic mechanisms that shaped this convergent design and the potential improvement in performance are not well understood. Here we analyze the effect of heterogenous flexibility on the flight performance of tumbling wings. Using experiments, numerical simulations, and scaling analysis, we demonstrate that spanwise tip flexibility that follows this empirical rule leads to improved flight performance. Our findings attribute this improvement to flutter-induced drag reduction. This mechanism is independent of the wing's auto-rotation and represents a more general trait of wings with non-uniform tip flexibility. We conclude by analyzing the effects of both spanwise and chordwise non-uniformity on the flight performance of tumbling seedpods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑