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Aeroacoustics of duct branches: with application to silencers
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strömningsakustik.ORCID-id: 0000-0001-7898-8643
2011 (Engelska)Ingår i: SAE technical paper series, ISSN 0148-7191Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The inclusion of flow-acoustic interaction effects in linear acoustic multiport models has been studied. It is shown, using a T-junction as illustration example, that as long the acoustic system is linear the required information is included in a scattering matrix obtained by experimental or numerical studies. Assuming small Mach numbers and low frequencies-as in most automotive silencer applications-the scattering matrix for the T-junction can be approximated using quasi-steady models. Models are derived that holds for all possible configurations of grazing and bias flow in the T-junctions. The derived models are then used to predict the performance of a novel silencer concept, where a resonator is formed by acoustically short-circuiting the inlet and outlet ducts of a flow reversal chamber. The agreement between experiments and simulations is excellent, justifying the use of the quasi-steady modeling approach.

Ort, förlag, år, upplaga, sidor
SAE International , 2011.
Nyckelord [en]
Acoustic systems, Flow reversals, Flow-acoustic interaction, Multi-port, Numerical studies, Outlet duct, Quasi-steady model, Quasi-steady modeling, Scattering matrices, T junctions, Acoustic fields, Mach number, Scattering parameters, Vehicles
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-148738DOI: 10.4271/2011-24-0218Scopus ID: 2-s2.0-84877191241OAI: oai:DiVA.org:kth-148738DiVA, id: diva2:740499
Konferens
10th International Conference on Engines and Vehicles, ICE 2011; Naples; Italy; 11 September 2011 through 15 September 2011
Anmärkning

QC 20140825. QC 20160129

Tillgänglig från: 2014-08-25 Skapad: 2014-08-11 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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Åbom, MatsGlav, Ragnar

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Karlsson, M.Åbom, MatsGlav, Ragnar
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