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Large eddy simulations 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. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).ORCID-id: 0000-0001-7898-8643
KTH, Skolan för teknikvetenskap (SCI), Mekanik. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
2015 (Engelska)Ingår i: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 345, s. 162-177Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The scattering of plane waves by an orifice plate with a strong bias flow, placed in a circular or square duct, is studied through large eddy simulations and dynamic mode decomposition. The acoustic-flow interaction is illustrated, showing that incoming sound waves at a Strouhal number of 0.43 trigger a strong axisymmetric flow structure in the orifice in the square duct, and interact with a self-sustained axisymmetric oscillation in the circular duct orifice. These structures then generate a strong sound, increasing the acoustic energy at the frequency of the incoming wave. The structure triggered in the square duct is weaker than that present in the circular duct, but stronger than structures triggered by waves at other frequencies. Comparing the scattering matrix with measurements, there is a good agreement. However, the results are found to be sensitive to the inflow, where the self-sustained oscillation in the circular duct simulation is an artefact of an axisymmetric, undisturbed inflow. This illustrates a problem with using an undisturbed inflow for studying vortex-sound effects, and can be of interest when considering musical instruments, where the aim is to get maximum amplification of specific tones. Further, it illustrates that at the frequency where an amplification of acoustic energy is found for the orifice plate, the flow has a natural instability, which is suppressed by non-axisymmetry and incoming disturbances.

Ort, förlag, år, upplaga, sidor
2015. Vol. 345, s. 162-177
Nyckelord [en]
aero-acoustics, dynamic mode decomposition, orifice-plate, large eddy simulations
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:kth:diva-161901DOI: 10.1016/j.jsv.2015.02.012ISI: 000350998800011Scopus ID: 2-s2.0-84924497139OAI: oai:DiVA.org:kth-161901DiVA, id: diva2:796209
Anmärkning

QC 20150330

Tillgänglig från: 2015-03-18 Skapad: 2015-03-18 Senast uppdaterad: 2017-12-04Bibliografiskt 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)Mekanik
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