Resonance and propulsion performance of a heaving flexible wing - Physics > Fluid DynamicsReport as inadecuate




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Abstract: The influence of the bending rigidity of a flexible heaving wing on itspropulsive performance in a two-dimensional imposed parallel flow isinvestigated in the inviscid limit. Potential flow theory is used to describethe flow over the flapping wing. The vortical wake of the wing is accounted forby the shedding of point vortices with unsteady intensity from the wing-strailing edge. The trailing-edge flapping amplitude is shown to be maximal fora discrete set of values of the rigidity, at which a resonance occurs betweenthe forcing frequency and a natural frequency of the system. A quantitativecomparison of the position of these resonances with linear stability analysisresults is presented. Such resonances induce maximum values of the meandeveloped thrust and power input. The flapping efficiency is also shown to begreatly enhanced by flexibility.



Author: S. Michelin, S. G. Llewellyn Smith

Source: https://arxiv.org/



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