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The acoustic impedance of a confined circular side branch orifice subjected to grazing-bias flow
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2010 (English)In: 16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), 2010, 2010-4007- p.Conference paper (Refereed)
Abstract [en]

The acoustic impedance of a circular confined side branch orifice is studied under various mean flow and acoustic incidence configurations. The actual geometry is a T-Junction where the main duct diameter is kept constant while the side branch diameter can be varied. The results vary significantly in between the grazing-bias inflow case and the grazing-bias outflow case as well as with the incidence of the acoustic perturbation to the system. The flow-acoustic interaction seen with grazing flow tend to cancel with bias outflow while it is still present, although shifted in frequency, with bias inflow.

Place, publisher, year, edition, pages
2010. 2010-4007- p.
Keyword [en]
Acoustic perturbations, Flow-acoustic interaction, Grazing flows, Mean flow, Side branches, T junctions, Acoustic impedance measurement, Aeroacoustics, Orifices, Acoustic impedance
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-150070ScopusID: 2-s2.0-78649590407ISBN: 978-160086744-6OAI: diva2:741980
16th AIAA/CEAS Aeroacoustics Conference (31st AIAA Aeroacoustics Conference), 7 June 2010 through 9 June 2010, Stockholm, Sweden

QC 20140829

Available from: 2014-08-29 Created: 2014-08-29 Last updated: 2014-08-29Bibliographically approved

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Karlsson, Mikael
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Marcus Wallenberg Laboratory MWL
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