Resonance and propulsion performance of a heaving flexible wing
Resonance and propulsion performance of a heaving flexible wing
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DOI：
10.1063/1.3177356
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发表时间：
2009-07-01
影响因子：
4.6
通讯作者：
Smith, Stefan G. Llewellyn
中科院分区：
文献类型：
--
作者：
Michelin, Sebastien;Smith, Stefan G. Llewellyn
在无粘极限下研究了二维强加平行流中柔性垂荡翼的弯曲刚度对其推进性能的影响。势流理论用于描述扑翼上的流动。机翼的涡流尾流是由机翼后缘脱落的强度不稳定的点涡引起的。对于一组离散的刚度值，后缘扑动幅度显示为最大，此时系统的受力频率和固有频率之间发生共振。提出了这些共振位置与线性稳定性分析结果的定量比较。这种共振引起平均推力和功率输入的最大值。灵活性也大大提高了扑动效率。
The influence of the bending rigidity of a flexible heaving wing on its propulsive performance in a two-dimensional imposed parallel flow is investigated in the inviscid limit. Potential flow theory is used to describe the flow over the flapping wing. The vortical wake of the wing is accounted for by the shedding of point vortices with unsteady intensity from the wing's trailing edge. The trailing-edge flapping amplitude is shown to be maximal for a discrete set of values of the rigidity, at which a resonance occurs between the forcing frequency and a natural frequency of the system. A quantitative comparison of the position of these resonances with linear stability analysis results is presented. Such resonances induce maximum values of the mean developed thrust and power input. The flapping efficiency is also shown to be greatly enhanced by flexibility.