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LES of acoustic-flow interaction at an orifice plate
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-4156-8976
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics.
2012 (English)In: 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), American Institute of Aeronautics and Astronautics Inc. , 2012Conference paper, Published paper (Refereed)
Abstract [en]

The scattering of plane waves by a thick orifice plate, placed in a circular or square duct with ow, is studied through Large Eddy Simulation. The scattering matrix is computed and compared to measurements, showing reasonably good agreement except around one frequency (St ≈ 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 fiuctuations.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics Inc. , 2012.
Keywords [en]
Aeroacoustics, Aviation, Flow interactions, Large eddy simulation, Orifices, Plates (structural components), Acoustic energy, Axisymmetric, Background flow, Circular ducts, Dynamic mode decompositions, One frequency, Orifice plate, Scattering matrices, Ducts
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-284836DOI: 10.2514/6.2012-2064Scopus ID: 2-s2.0-85085400550ISBN: 9781600869327 (print)OAI: oai:DiVA.org:kth-284836DiVA, id: diva2:1501106
Conference
18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference), 4 June 2012 through 6 June 2012
Note

QC 20201116

Available from: 2020-11-16 Created: 2020-11-16 Last updated: 2022-06-25Bibliographically approved

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Alenius, EmmaÅbom, MatsFuchs, Laszlo

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  • apa
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Output format
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