Acoustic Scattering by a Finite Rigid Plate with a Poroelastic Extension
Journal of Fluid Mechanics
Cambridge University Press
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Ayton, L. (2016). Acoustic Scattering by a Finite Rigid Plate with a Poroelastic Extension. Journal of Fluid Mechanics, 791 414-438. https://doi.org/10.1017/jfm.2016.59
The scattering of sound by a finite rigid plate with a finite poroelastic extension interacting with an unsteady acoustic source is investigated to determine the effects of porosity, elasticity, and the length of the extension when compared to a purely rigid plate. The problem is solved using the Wiener-Hopf technique, and an approximate Wiener-Hopf factorisation process is implemented to yield reliable far-field results quickly. Importantly, finite chord-length effects are taken into account, principally the interaction of a rigid leading-edge acoustic field with a poroelastic trailing-edge acoustic field. The model presented discusses how the poroelastic trailing-edge property of owls’ wings could inspire quieter aeroacoustic designs in bladed systems such as wind turbines, and provides a framework for analysing the potential noise reduction of these designs.
The author is grateful to Sidney Sussex College for providing financial support.
External DOI: https://doi.org/10.1017/jfm.2016.59
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253416