论文标题
纵横比对滚动和扭曲箔的影响
Effects of Aspect Ratio on Rolling and Twisting Foils
论文作者
论文摘要
由于其内在的科学丰富度及其对新型机器人系统的适用性，因此越来越多地研究了飞行和游泳。剥离理论通常用于拍打翅膀，但是这种建模仅适用于无限纵横比（AR）的极限，而几何和运动学实际上是均匀的。这项工作比较了剥离理论的流量和力量和三维拍打箔，在改变箔AR的同时，保持了滚动和扭曲运动学的相似性。我们发现有限AR和跨度变化的运动学的关键影响是产生时间周期性的跨度流，该流动稳定涡流结构并增强了箔根处的动力学。开发了一种类似于prandtl有限翼理论的对箔的方面比例校正，从而实现了剥离理论在有限纵横比拍打箔的分析和设计中的未来使用。
Flapping flight and swimming are increasingly studied both due to their intrinsic scientific richness and their applicability to novel robotic systems. Strip theory is often applied to flapping wings, but such modeling is only rigorously applicable in the limit of infinite aspect ratio (AR) where the geometry and kinematics are effectively uniform. This work compares the flow features and forces of strip theory and three-dimensional flapping foils, maintaining similitude in the rolling and twisting kinematics while varying the foil AR. We find the key influence of finite AR and spanwise varying kinematics is the generation of a time-periodic spanwise flow which stabilizes the vortex structures and enhances the dynamics at the foil root. An aspect-ratio correction for flapping foils is developed analogous to Prandtl finite wing theory, enabling future use of strip theory in analysis and design of finite aspect ratio flapping foils.
