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dc.contributor.authorYoung, Annaen
dc.contributor.authorCao, Tengen
dc.contributor.authorDay, IJen
dc.contributor.authorLongley, Johnen
dc.date.accessioned2017-06-01T13:31:40Z
dc.date.available2017-06-01T13:31:40Z
dc.date.issued2017-09-01en
dc.identifier.issn0889-504X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/264583
dc.description.abstractIn this paper, experiments and numerical modeling are used to quantify the effects of clearance and eccentricity on compressor performance and to examine the influence of each on flow distribution and stall margin. A change in the size of the tip-clearance gap influences the pressure rise and the stall margin of a compressor. Eccentricity of the tipclearance gap then further exacerbates the negative effects of increasing tip-clearance. There are few studies in the literature dealing with the combined effect of clearance and eccentricity. There is also little guidance for engine designers, who have traditionally used rules of thumb to quantify these effects. One such rule states that the stall margin of an eccentric machine will be equal to that of a concentric machine with uniform clearance equal to the maximum eccentric clearance. In this paper, this rule of thumb is checked using experimental data and found to be overly pessimistic. In addition, eccentric clearance causes a variation in axial velocity around the circumference of the compressor. The current study uses a three-dimensional model which demonstrates the importance of radial flow gradients in capturing this redistribution. Flow redistribution has been treated analytically in the past, and for this reason, previous modeling has been restricted to two dimensions. The circumferential variation in axial velocity is also examined in terms of the local stability of the flow by considering the stalling flow coefficient of an equivalent axisymmetric compressor with the same local tip-clearance. The large clearance sector of the annulus is found to operate beyond its equivalent axisymmetric stall limit, which means that the small clearance sector of the annulus must be stabilizing the large clearance sector. An improved rule of thumb dealing with the effects of eccentricity is presented.
dc.description.sponsorshipThe authors thank Rolls-Royce, the EPSRC and the Maudslay Society for the funding that made this research possible.
dc.language.isoenen
dc.publisherASME
dc.titleAccounting for eccentricity in compressor performance predictionen
dc.typeArticle
prism.issueIdentifier9en
prism.number091008en
prism.publicationDate2017en
prism.publicationNameJournal of Turbomachineryen
prism.volume139en
dc.identifier.doi10.17863/CAM.9775
dcterms.dateAccepted2017-02-24en
rioxxterms.versionofrecord10.1115/1.4036201en
rioxxterms.versionAMen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2017-09-01en
dc.contributor.orcidYoung, Anna [0000-0002-3517-5850]
dc.identifier.eissn1528-8900
rioxxterms.typeJournal Article/Reviewen
cam.issuedOnline2017-04-19en
dc.identifier.urlhttp://turbomachinery.asmedigitalcollection.asme.org/article.aspx?articleid=2612091en
rioxxterms.freetoread.startdate2017-10-19


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