Vibration and sound of a flapping airfoil: The limit of small bending rigidity

We investigate the near and far fields of a thin elastic airfoil set at uniform low-Mach flow and subject to leading-edge heaving actuation. The airfoil is “hanged” in the vertical direction and is free at its downstream end, so that “hanging chain” gravity-induced tension forces apply. The structur...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2017-05, Vol.141 (5), p.3513-3513
Main Authors: Manela, Avshalom, Weidenfeld, Michael
Format: Article
Language:English
Online Access:Get full text
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Summary:We investigate the near and far fields of a thin elastic airfoil set at uniform low-Mach flow and subject to leading-edge heaving actuation. The airfoil is “hanged” in the vertical direction and is free at its downstream end, so that “hanging chain” gravity-induced tension forces apply. The structure bending rigidity is assumed small, and we focus on analyzing the differences between a highly elastic airfoil and a membrane (where the bending rigidity vanishes). The near field is studied based on potential thin airfoil theory, whereas the acoustic field is investigated using the Powell-Howe acoustic analogy. The results shed light on the specific effect of structure bending stiffness on the dynamics and acoustic disturbance of an airfoil.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4987371