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The acoustic Green's function for swirling flow in a lined duct

dc.creatorMathews, JR
dc.creatorPeake, Nigel
dc.date.accessioned2017-02-07
dc.date.accessioned2018-11-24T23:19:57Z
dc.date.available2017-04-28T14:15:39Z
dc.date.available2018-11-24T23:19:57Z
dc.date.issued2017-05-12
dc.identifierhttps://www.repository.cam.ac.uk/handle/1810/263887
dc.identifier.urihttp://repository.aust.edu.ng/xmlui/handle/123456789/3517
dc.description.abstractThis paper considers the acoustic field inside an annular duct carrying mean axial and swirling flow and with either acoustically hard or lined walls. The particular aim is to compute the Green's function, which is required for predicting the noise generated by known acoustic sources, both approximately and numerically. Asymptotic approximations for first the eigenmodes and then the Green's function are derived in the realistic limit of high reduced frequency, which are found to agree very favourably with results determined numerically, even for relatively modest frequencies. Using a blend of uniform WKB asymptotics and numerics, singular cases in which multiple turning points are present are treated, allowing computation of accurate results across a very wide range of parameter values and flows.
dc.languageen
dc.publisherElsevier
dc.publisherJournal of Sound and Vibration
dc.subjectaeroacoustics
dc.subjectturbomachinery
dc.subjectswirl
dc.subjectGreen's function
dc.subjecthigh-frequency asymptotics
dc.titleThe acoustic Green's function for swirling flow in a lined duct
dc.typeArticle


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