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Aeroacoustics of rectangular T-junctions subject to combined grazing and bias flows - An experimental investigation
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0001-7898-8643
2015 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 340, 152-166 p.Article in journal (Refereed) Published
Abstract [en]

Scattering matrices are determined experimentally and used to study the low amplitude interaction, between the acoustic and the hydrodynamic fields in a T-junction of rectangular ducts. In particular, combinations of grazing and bias flows are investigated in the study. It is observed that for all flow combinations, waves incident on the junction at the downstream side only are attenuated, while waves incident at the other branches may be amplified or attenuated, depending on the Strouhal number. When bias in flow is introduced to a grazing flow, there is first an increase and then a decrease in both amplification and attenuation, as the bias in-flow Mach number is increased. Comparing with T-junctions of circular ducts, the interaction is stronger for rectangular duct junctions.

Place, publisher, year, edition, pages
2015. Vol. 340, 152-166 p.
Keyword [en]
Acoustic fields, Ducts, Circular ducts, Experimental investigations, Grazing flows, Hydrodynamic field, Low-amplitude, Rectangular ducts, Scattering matrices, T junctions
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-160732DOI: 10.1016/j.jsv.2014.11.040ISI: 000348033500010Scopus ID: 2-s2.0-84921272529OAI: oai:DiVA.org:kth-160732DiVA: diva2:792112
Note

QC 20150303

Available from: 2015-03-03 Created: 2015-02-27 Last updated: 2017-12-04Bibliographically approved

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Åbom, Mats

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Holmberg, AndreasKarlsson, MikaelÅbom, Mats
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Marcus Wallenberg Laboratory MWLLinné Flow Center, FLOWCompetence Center for Gas Exchange (CCGEx)
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