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dc.contributor.authorBlackburn, Robert J
dc.contributor.authorMiller, Robert
dc.date.accessioned2019-07-29T13:41:54Z
dc.date.available2019-07-29T13:41:54Z
dc.date.issued2017-01
dc.identifier.issn0748-4658
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/295025
dc.description.abstractThis paper describes a new method for calculating the performance of pressure gain combustors for gas turbine applications. The method judges the value of a combustor based on the flow’s increased potential to do shaft work from combustor inlet to exit. This potential is defined as the work that could be extracted from the flow by a reversible adiabatic turbine exhausting to the combustor supply pressure. A new performance metric, the Rayleigh efficiency, is defined as the increased potential of the flow to do shaft work divided by the heat input. A novel control volume analysis is used, which directly links this performance metric to source terms within the combustor. Two primary source terms are shown: The first is a thermal creation term, which occurs in regions of the flow where combustion heat release occurs at pressures above that of the environment and acts to raise the flow’s potential to do shaft work. The term is a nonlinear analog of Lord Rayleigh’s acoustic energy creation term, from his 1878 thermoacoustic criterion. The second term is a viscous destruction term that always acts to reduce the flow’s potential to do shaft work. In the final part of the paper, the utility of the method is demonstrated using experimental measurements and computational predictions from a SNECMA (Société nationale d'études et de construction de moteurs d'aviation)/Lockwood-type valveless pulse combustor. The analysis enables a number of previously unanswered questions about pulse combustors to be answered.
dc.description.sponsorshipThe authors would like to thank Fred Schauer and John Hoke at AFRL and EOARD for funding the work on performance metrics, EPSRC for funding the research
dc.languageen
dc.publisherAmerican Institute of Aeronautics and Astronautics (AIAA)
dc.titleThe Rayleigh Efficiency of Pressure Gain Combustors
dc.typeArticle
prism.endingPage61
prism.issueIdentifier1
prism.publicationDate2017
prism.publicationNameJournal of Propulsion and Power
prism.startingPage51
prism.volume33
dc.identifier.doi10.17863/CAM.42101
dcterms.dateAccepted2016-04-26
rioxxterms.versionofrecord10.2514/1.b36073
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2017-01
dc.identifier.eissn1533-3876
dc.publisher.urlhttps://arc.aiaa.org/doi/10.2514/1.B36073
rioxxterms.typeJournal Article/Review
cam.issuedOnline2016-08-26
dc.identifier.urlhttps://arc.aiaa.org/doi/10.2514/1.B36073


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