Point vortex model for prediction of sound generated by a wing with flap interacting with a passing vortex.

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ID: 47807
2013
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Abstract
Acoustic signature of a rigid wing, equipped with a movable downstream flap and interacting with a line vortex, is studied in a two-dimensional low-Mach number flow. The flap is attached to the airfoil via a torsion spring, and the coupled fluid-structure interaction problem is analyzed using thin-airfoil methodology and application of the emended Brown and Michael equation. It is found that incident vortex passage above the airfoil excites flap motion at the system natural frequency, amplified above all other frequencies contained in the forcing vortex. Far-field radiation is analyzed using Powell-Howe analogy, yielding the leading order dipole-type signature of the system. It is shown that direct flap motion has a negligible effect on total sound radiation. The characteristic acoustic signature of the system is dominated by vortex sound, consisting of relatively strong leading and trailing edge interactions of the airfoil with the incident vortex, together with late-time wake sound resulting from induced flap motion. In comparison with the counterpart rigid (non-flapped) configuration, it is found that the flap may act as sound amplifier or absorber, depending on the value of flap-fluid natural frequency. The study complements existing analyses examining sound radiation in static- and detached-flap configurations.
Reference Key
manela2013pointthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Manela, A;Huang, L;
Journal the journal of the acoustical society of america
Year 2013
DOI
10.1121/1.4792246
URL
Keywords
avian covert feathers flight feathers quill knobs smooth muscle wing shape

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