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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 Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx). KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
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), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-7898-8643
2013 (English)In: 19th AIAA/CEAS Aeroacoustics Conference, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Experimentally determined scattering matrices are 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. Common for all flow combinations is that waves incident on the junction at the downstream side are only 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
2013.
Keyword [en]
Circular ducts, Experimental investigations, Grazing flows, Hydrodynamic field, Low-amplitude, Rectangular ducts, Scattering matrices, T junctions
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-133370Scopus ID: 2-s2.0-84883667731ISBN: 978-162410213-4 (print)OAI: oai:DiVA.org:kth-133370DiVA: diva2:661954
Conference
19th AIAA/CEAS Aeroacoustics Conference; Berlin; Germany; 27 May 2013 through 29 May 2013
Note

QC 20131105

Available from: 2013-11-05 Created: 2013-10-31 Last updated: 2013-11-05Bibliographically approved

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Åbom, Mats

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Marcus Wallenberg Laboratory MWLCompetence Center for Gas Exchange (CCGEx)Linné Flow Center, FLOW
Fluid Mechanics and Acoustics

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