论文标题
在非均匀柔性机翼中提高飞行性能
Enhanced flight performance in non-uniformly flexible wings
论文作者
论文摘要
据信，生物推进器（例如机翼和鳍片）的灵活性与工程同龄人相比有助于飞行和游泳动物的更高性能。灵活性似乎遵循了一个通用设计规则，该规则从推进器跨度的远端诱导弯曲模式约为三分之一。但是，尚不清楚塑造这种收敛设计和潜在改善的空气动力学机制。在这里，我们分析了异源灵活性对翻滚机翼飞行性能的影响。使用实验，数值模拟和缩放分析，我们证明了这种经验规则遵循的跨度尖端灵活性会改善飞行性能。我们的发现将这种改进归因于扑动引起的拖曳减少。该机制独立于机翼的自动旋转，代表了具有不均匀尖端灵活性的机翼的更一般特征。我们通过分析Spanwise和Chordwise非均匀性对翻滚种子豆荚飞行性能的影响来结束。
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.
