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LES of Acoustic-Flow Interaction at an Orifice Plate
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).ORCID iD: 0000-0002-4156-8976
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2012 (English)In: 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 2012Conference paper, Published paper (Other academic)
Abstract [en]

The scattering of plane waves by a thick orifice plate, placed in a circular or square duct with flow, is studied through Large Eddy Simulation. The scattering matrix is computed and compared to measurements, showing reasonably good agreement except around one frequency ($St \approx 0.4$). Here a stronger amplification of acoustic energy is observed in the circular duct simulations than in the measurements and the square duct simulations. In order to improve the understanding of the interaction between an incoming wave, the flow, and the plate, a few frequencies are studied in more detail. A Dynamic Mode Decomposition is performed to identify flow structures at significant frequencies. This shows that the amplification of acoustic energy occurs at the frequency where the jet in the circular duct has an axisymmetric instability. Furthermore, the incoming wave slightly amplifies this instability, and suppresses background flow fluctuations.

Place, publisher, year, edition, pages
2012.
Keyword [en]
Acoustic energy, Background flow, Circular ducts, Dynamic mode decompositions, One frequency, Orifice plate, Scattering matrices, Square ducts
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-104561Scopus ID: 2-s2.0-84880687504ISBN: 9781600869327 (print)OAI: oai:DiVA.org:kth-104561DiVA: diva2:565041
Conference
18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference); ; 4 June 2012 through 6 June 2012
Funder
Swedish e‐Science Research CenterTrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20121210

Available from: 2012-11-06 Created: 2012-11-06 Last updated: 2016-09-01Bibliographically approved

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Alenius, EmmaÅbom, Mats

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MWL Flow acousticsCompetence Center for Gas Exchange (CCGEx)MechanicsLinné Flow Center, FLOW
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