Volume 90, Number 2, April 2010
|Number of page(s)||6|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||06 May 2010|
Scattering of sound waves by the wake flow of a flat plate
LEAF-NL, Departamento de Ingeniería Mecánica, Universidad de Chile - Casilla 2777, Santiago, Chile
Corresponding author: firstname.lastname@example.org
Accepted: 29 March 2010
We report an experimental investigation on the scattering of sound by the vortical wake flow created downstream a thin flat plate with a moving flap at the trailing edge. Two situations were examined: a) the free case, when the flap remained in a fixed horizontal position without external forcing and b) the harmonic forced case, when the flap is in continuous periodic motion of small amplitude. The sound scattering processes on both free- and forced-wake flows, provided a direct spectral measurement, in Fourier space, of the spatial and temporal modes of the wake as a function of the thickness-based Reynolds number.
PACS: 47.20.-k – Flow instabilities / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound
© EPLA, 2010
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