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The correlation of randomness with high tip losses in an axial flow fan stage

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dc.contributor.authorAlday, John Haneen
dc.contributor.committeechairNg, Wing Faien
dc.contributor.committeememberMoses, Hal L.en
dc.contributor.committeememberVick, Brian L.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:50:31Zen
dc.date.adate2009-11-24en
dc.date.available2014-03-14T21:50:31Zen
dc.date.issued1991-04-19en
dc.date.rdate2009-11-24en
dc.date.sdate2009-11-24en
dc.description.abstractThe results of a test program incorporating a dual hot wire aspirating probe to radially survey the by-pass duct downstream of an axial flow fan stage are presented. The probe measures time resolved total temperature and total pressure from which isentropic efficiency is calculated. The objective was to provide time resolved data to further the understanding of the flow and aid in determining the source of high losses located near the rotor tip. A technique for quantifying randomness of an unsteady flow is developed, and the randomness of the surveyed flow is shown to correlate with the losses. A new method of ensemble averaging instantaneous data is presented which produces an identifiable blade passage profile even in a random flowfield where traditional techniques often fail. Time averages of the aspirating probe data are shown to agree with conventional steady-state measurements within the experimental uncertainties. Unsteady features seen in the data are compared to similar features noted in the literature, and contour plots of the ensemble averaged data and unsteady fluctuations are presented.en
dc.description.degreeMaster of Scienceen
dc.format.extentxiv, 122 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11242009-020017en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11242009-020017/en
dc.identifier.urihttp://hdl.handle.net/10919/45984en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.A542.pdfen
dc.relation.isformatofOCLC# 24111960en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.A542en
dc.subject.lcshAxial loads -- Researchen
dc.subject.lcshFans (Machinery) -- Performance -- Researchen
dc.titleThe correlation of randomness with high tip losses in an axial flow fan stageen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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