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Sound Generating Flow Structures in a Thick Orifice Plate Jet
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
2014 (engelsk)Inngår i: Progress in Turbulence V: Proceedings of the iTi Conference in Turbulence 2012, Cham, Switzerland: Springer, 2014, s. 201-204Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

The aim of thiswork is to study sound generating flowstructures in a thickcircular orifice plate jet, placed in a circular duct. Large eddy simulations (LES)are performed for two jet Mach numbers, 0.4 and 0.9. Characteristic frequenciesin the flow, and their corresponding flow structures, are identified with dynamicmode decomposition (DMD). The results show that a tonal noise is generated atfrequencies where the jet displays strong ring vortices, in the plane wave range.The main sound generating mechanisms seems to be a fluctuating mass flow at theorifice opening and a fluctuating surface force at the plate sides, caused by the ringvortices. The frequencies are believed to be chosen, and strengthened, by a feedbackmechanism between the orifice in- and outlet.

sted, utgiver, år, opplag, sider
Cham, Switzerland: Springer, 2014. s. 201-204
Serie
Springer Proceedings in Physics, ISSN 0930-8989 ; 149
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-161903DOI: 10.1007/978-3-319-01860-7_32Scopus ID: 2-s2.0-84943226056ISBN: 978-3-319-01860-7 (tryckt)OAI: oai:DiVA.org:kth-161903DiVA, id: diva2:796222
Konferanse
5th iTi Conference in Turbulence, 2012; Bertinoro; Italy; 25 April 2012 through 25 April 2012
Merknad

QC 20150330. QC 20160314

Tilgjengelig fra: 2015-03-18 Laget: 2015-03-18 Sist oppdatert: 2016-09-01bibliografisk kontrollert

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