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dc.contributor.advisorFitzpatrick, John
dc.contributor.authorKennedy, John
dc.date.accessioned2016-12-01T10:15:46Z
dc.date.available2016-12-01T10:15:46Z
dc.date.issued2010
dc.identifier.citationJohn Kennedy, 'The influence of chevrons on the turbulent characteristics of jets', [thesis], Trinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering, 2010, pp 181
dc.identifier.otherTHESIS 8930
dc.identifier.urihttp://hdl.handle.net/2262/78040
dc.description.abstractTo minimize the significant environmental impact of air travel a reduction in noise pollution from jet engines is required. This has led to a renewed focus on active and passive techniques which modify the turbulence characteristics and hence the noise production mechanisms in the jet. One of the most prominent technologies of this type about to be implemented on commercial aircraft are chevron nozzles. It has been shown that this technology can provide noise reductions without significant thrust penalties. However chevron nozzles suffer from a high frequency noise penalty that has been attributed to increased mixing in the near nozzle region. Current noise prediction methods can not handle the complex changes to the turbulence properties of the jet. While the effects on the far field sound and on the jet structure have been well documented more fundamental research is required on how chevrons affect the turbulence properties in order to improve the current noise prediction capabilities. A detailed investigation has been carried out comparing three chevron nozzles to a baseline single jet in which extensive measurements have been performed to determine the turbulent characteristics of the flows. The investigation is primarily concerned with the affects of chevron immersion on the flow.
dc.format1 volume
dc.language.isoen
dc.publisherTrinity College (Dublin, Ireland). Department of Mechanical and Manufacturing Engineering
dc.relation.isversionofhttp://stella.catalogue.tcd.ie/iii/encore/record/C__Rb14380237
dc.subjectMechanical Engineering, Ph.D.
dc.subjectPh.D. Trinity College Dublin
dc.titleThe influence of chevrons on the turbulent characteristics of jets
dc.typethesis
dc.type.supercollectionthesis_dissertations
dc.type.supercollectionrefereed_publications
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (Ph.D.)
dc.rights.ecaccessrightsopenAccess
dc.format.extentpaginationpp 181
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