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dc.contributor.authorHoward III, Joseph S.en_US
dc.date.accessioned2014-03-14T20:39:14Z
dc.date.available2014-03-14T20:39:14Z
dc.date.issued1999-04-26en_US
dc.identifier.otheretd-060299-183959en_US
dc.identifier.urihttp://hdl.handle.net/10919/33391
dc.description.abstractAn analytical investigation of dynamic compressor characteristics was conducted with the goal to make fundamental improvements in the modeling of dynamic compressor stage characteristics. It was determined that present state-of-the-art in modeling dynamic compressor stage characteristics is the use of steady-state characteristics derived from flow model calculations, with first-order time lag response functions applied to account for dynamic departures from the steady and quasi-steady performance predictions. This investigation developed a blade frequency response function (FRF) method for describing the dynamic blade response. Once the frequency response function of a blade row has been determined, any time or spatially dependent, non-uniform flow can be applied and the model will predict the dynamic blade response. The first step of this research was to develop FRFs based on first-order lag equations and to test the method using these simple transfer functions. The next step was to develop FRFs based on a dynamic blade lift model for a simple, idealized compressor blade row model. It was found that chord length has a strong influence on the FRF, which is related to the fluid transport time through the blade passage. The final step was to incorporate experimental data obtained from a study of dynamic wake response of an isolated rotor. It was assumed that the wake response was well correlated with the dynamic lift response of a blade row. It was found that aerodynamic loading, distortion strength, and span position all influence the frequency response functions, which differ greatly from simple first-order lag equations. It was determined that a number of FRFs are needed to describe the dynamic blade response accurately.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartEtd2.pdfen_US
dc.relation.haspartEtd4.pdfen_US
dc.relation.haspartEtd.pdfen_US
dc.relation.haspartEtd3.pdfen_US
dc.rightsI hereby grant to Virginia Tech or its agents the right to archive and to make available my thesis or dissertation in whole or in part in the University Libraries in all forms of media, now or hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertation.en_US
dc.subjectComprssoren_US
dc.subjectModelingen_US
dc.subjectDynamicen_US
dc.subjectDistortionen_US
dc.subjectWakeen_US
dc.subjectResponseen_US
dc.titleImproved Methods for Modeling Dynamic Stage Characteristicsen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairO'Brien, Walter F. Jr.en_US
dc.contributor.committeememberDancey, Clinton L.en_US
dc.contributor.committeememberKing, Peter S.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-060299-183959/en_US
dc.date.sdate1999-06-02en_US
dc.date.rdate2000-06-05
dc.date.adate1999-06-05en_US


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