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dc.contributor.authorMagri, L
dc.date.accessioned2017-12-11T16:59:23Z
dc.date.available2017-12-11T16:59:23Z
dc.date.issued2017-10-10
dc.identifier.issn0022-1120
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/270157
dc.description.abstractA one-dimensional, unsteady nozzle flow is modelled to identify the sources of indirect noise in multi-component gases. First, from non-equilibrium thermodynamics relations, it is shown that a compositional inhomogeneity advected in an accelerating flow is a source of sound induced by inhomogeneities in the mixture (i) chemical potentials and (ii) specific heat capacities. Second, it is shown that the acoustic, entropy and compositional linear perturbations evolve independently from each other and they become coupled through mean-flow gradients and/or at the boundaries. Third, the equations are cast in invariant formulation and a mathematical solution is found by asymptotic expansion of path-ordered integrals with an infinite radius of convergence. Finally, the transfer functions are calculated for a supersonic nozzle with finite spatial extent perturbed by a methane-air compositional inhomogeneity. The proposed framework will help identify and quantify the sources of sound in nozzles with relevance, for example, to aeronautical gas turbines.
dc.description.sponsorshipThe author is supported by the Royal Academy of Engineering Research Fellowships Scheme.
dc.publisherCambridge University Press
dc.subjectacoustics
dc.subjectgas dynamics
dc.subjectreacting flows
dc.titleOn indirect noise in multicomponent nozzle flows
dc.typeArticle
prism.issueIdentifierR2
prism.publicationDate2017
prism.publicationNameJournal of Fluid Mechanics
prism.volume828
dc.identifier.doi10.17863/CAM.16990
dcterms.dateAccepted2017-08-17
rioxxterms.versionofrecord10.1017/jfm.2017.591
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2017-10-10
dc.contributor.orcidMagri, Luca [0000-0002-0657-2611]
dc.identifier.eissn1469-7645
dc.publisher.urlhttp://dx.doi.org/10.1017/jfm.2017.591
rioxxterms.typeJournal Article/Review
pubs.funder-project-idRoyal Academy of Engineering (RAEng)
cam.issuedOnline2017-09-12
rioxxterms.freetoread.startdate2018-12-11


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