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Low frequency sound absorption at sharp edges in flow ducts
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-4103-0129
2005 (English)In: 12th International Congress on Sound and Vibration 2005: ICSV 2005, 2005, 2390-2397 p.Conference paper (Refereed)
Abstract [en]

Modelling the acoustic scattering and absorption at an area expansion in a flow duct requires the incorporation of the flow-acoustic interaction. The vortex sheet model is an analytical linear acoustic model, where the flow field at an area expansion in a duct is described as a jet issuing into the larger part of the duct. In this paper, we study plane wave propagation at such an area expansion. The flow-acoustic interaction is described in terms of energy flow. A classification of modes as "hydrodynamic" and "acoustic" is used to separate the acoustic energy from the part of the energy arising from the steady flow field. Theoretical results are presented together with experimental data. The energy distribution and dissipation of acoustic energy is studied schematically, indicating the effects of the flow acoustic interaction due to the area expansion and the sharp edge.

Place, publisher, year, edition, pages
2005. 2390-2397 p.
, International Congress on Sound and Vibration, ICSV, Vol. 3
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-148528ScopusID: 2-s2.0-84881587009ISBN: 978-162748149-6OAI: diva2:738980
12th International Congress on Sound and Vibration 2005, ICSV 2005; Lisbon, Portugal, 11-14 July, 2005

QC 20140819

Available from: 2014-08-19 Created: 2014-08-08 Last updated: 2014-08-19Bibliographically approved

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