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LES of Acoustic-Flow Interaction at an Orifice Plate
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strömningsakustik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).ORCID-id: 0000-0002-4156-8976
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Strömningsakustik.ORCID-id: 0000-0001-7898-8643
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för teknikvetenskap (SCI), Centra, Linné Flow Center, FLOW.
2012 (Engelska)Ingår i: 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 2012Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
2012.
Nyckelord [en]
Acoustic energy, Background flow, Circular ducts, Dynamic mode decompositions, One frequency, Orifice plate, Scattering matrices, Square ducts
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-104561Scopus ID: 2-s2.0-84880687504ISBN: 9781600869327 (tryckt)OAI: oai:DiVA.org:kth-104561DiVA, id: diva2:565041
Konferens
18th AIAA/CEAS Aeroacoustics Conference 2012 (33rd AIAA Aeroacoustics Conference); ; 4 June 2012 through 6 June 2012
Forskningsfinansiär
Swedish e‐Science Research CenterTrenOp, Transport Research Environment with Novel Perspectives
Anmärkning

QC 20121210

Tillgänglig från: 2012-11-06 Skapad: 2012-11-06 Senast uppdaterad: 2016-09-01Bibliografiskt granskad

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Alenius, EmmaÅbom, Mats

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Alenius, EmmaÅbom, MatsFuchs, Laszlo
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MWL StrömningsakustikCompetence Center for Gas Exchange (CCGEx)MekanikLinné Flow Center, FLOW
Strömningsmekanik och akustik

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