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Low frequency sound absorption at sharp edges in flow ducts
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0003-4103-0129
2005 (Engelska)Ingår i: 12th International Congress on Sound and Vibration 2005: ICSV 2005, 2005, s. 2390-2397Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
2005. s. 2390-2397
Serie
International Congress on Sound and Vibration, ICSV ; Vol. 3
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-148528Scopus ID: 2-s2.0-84881587009ISBN: 978-162748149-6 (tryckt)OAI: oai:DiVA.org:kth-148528DiVA, id: diva2:738980
Konferens
12th International Congress on Sound and Vibration 2005, ICSV 2005; Lisbon, Portugal, 11-14 July, 2005
Anmärkning

QC 20140819

Tillgänglig från: 2014-08-19 Skapad: 2014-08-08 Senast uppdaterad: 2014-08-19Bibliografiskt granskad

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Boij, Susann

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