Aeroacoustics of duct branches: with application to silencers
2011 (English)In: SAE technical paper series, ISSN 0148-7191Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
SAE International , 2011.
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
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-148738DOI: 10.4271/2011-24-0218ScopusID: 2-s2.0-84877191241OAI: oai:DiVA.org:kth-148738DiVA: diva2:740499
10th International Conference on Engines and Vehicles, ICE 2011; Naples; Italy; 11 September 2011 through 15 September 2011
QC 20140825. QC 201601292014-08-252014-08-112016-01-29Bibliographically approved