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dc.contributor.authorMaierhofer, Georg
dc.contributor.authorPeake, Nigel
dc.date.accessioned2021-11-06T00:31:47Z
dc.date.available2021-11-06T00:31:47Z
dc.date.issued2022-03-03
dc.identifier.issn0022-460X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/330384
dc.description.abstractWe study the balance of outgoing and incoming power for acoustic wave scattering by a cascade of flat blades in uniform subsonic mean flow. In nonzero mean flow the Kutta condition at the trailing edge of the cascade plates leads to the production of vorticity in the form of unsteady vortex sheets attached at the trailing edges, which results in a hydrodynamic power flux and the exchange of energy between the unsteady vorticity and the acoustic field. Although the scattering problem itself has been subject to much previous research, a comprehensive study of the composition of the outgoing energy flux for cascade scattering has received little previous attention. As an application of our detailed study we show how the time-averaged energy balance can be used to explain certain symmetries of the field in the angle of incidence with respect to the cascade face when there is no mean flow and the effect of zero acoustic reflection at certain angles of incidence with mean flow. We also show that, depending on the angle of incidence of the acoustic wave and the velocity of the mean flow, the vortex sheets can either absorb or generate acoustic energy. This can, for certain parameter values, result in a net increase in outgoing sound power over the incident sound power, as we demonstrate on a number of numerical examples that are computed using the semi-analytical solution described in recent work by Maierhofer and Peake (J. Sound Vib., vol. 481 (2020), 115418).
dc.languageen
dc.publisherElsevier BV
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleAcoustic and hydrodynamic power of wave scattering by an infinite cascade of plates in mean flow
dc.typeArticle
prism.endingPage116564
prism.number116564
prism.publicationDate2021
prism.publicationNameJournal of Sound and Vibration
prism.startingPage116564
dc.identifier.doi10.17863/CAM.77827
dcterms.dateAccepted2021-10-18
rioxxterms.versionofrecord10.1016/j.jsv.2021.116564
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2021-10
dc.contributor.orcidMaierhofer, Georg [0000-0002-9764-8596]
dc.contributor.orcidPeake, Nigel [0000-0001-8346-3219]
dc.identifier.eissn1095-8568
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEPSRC (1946594)
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/L016516/1)
cam.issuedOnline2021-10-27
cam.orpheus.success2021-11-05 - Embargo set during processing via Fast-track
rioxxterms.freetoread.startdate2022-10-31


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Attribution-NonCommercial-NoDerivatives 4.0 International
Except where otherwise noted, this item's licence is described as Attribution-NonCommercial-NoDerivatives 4.0 International