Transmission of sound through a single vortex
Laboratoire de Physique CNRS UMR 5672, École Normale Supérieure, 46 Allée d'Italie, 69007 Lyon, France
Corresponding author: a firstname.lastname@example.org
Revised: 17 November 2003
Published online: 15 March 2004
We investigate experimentally the deformation of acoustic wavefronts after crossing of a single, isolated vortex in free space. The incident sound wavelength can be varied in a large domain. We study the wavefronts at variable distance after transmission through the vortex, when the wavelength and the vortex strength are varied. For small wavelength (, the vortex core size) our results are in very good agreement with predictions and simulations based on geometrical acoustics principles. However, as the sound wavelength increases to value comparable with the vortex diameter, the deformation of the wavefronts show the development of scattering contributions, with characteristics in agreement with recent theoretical and numerical studies.
PACS: 43.28.+h – Aeroacoustics and atmospheric sound / 47.32.-y – Rotational flow and vorticity
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004