Linear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustor

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dc.contributor.authorFannin, Christopher A.en
dc.contributor.committeechairSaunders, William R.en
dc.contributor.committeememberVandsburger, Urien
dc.contributor.committeememberRobertshaw, Harry H.en
dc.contributor.committeememberBaumann, William T.en
dc.contributor.committeememberChelliah, Harshaen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:14:18Zen
dc.date.adate2000-07-29en
dc.date.available2014-03-14T20:14:18Zen
dc.date.issued2000-07-25en
dc.date.rdate2001-07-29en
dc.date.sdate2000-07-26en
dc.description.abstractA dynamic model is developed for the purpose of predicting stability characteristics of an industrial-scale, swirl-stabilized premixed combustor located at the National Energy Technology Laboratory (NETL) in Morgantown, WV. The model consists of modular blocks that assemble into an open-loop transfer function depicting the frequency response of the thermoacoustic system. These blocks include the system acoustic response to unsteady heat release forcing, the air-side coupling of acoustic particle velocity to inlet fuel mass fraction, transport delays present in the mixing nozzle and combustion chamber, and dynamic heat release excitation from unsteady inlet fuel mass fraction. By examing the frequency response with linear stability techniques, the existence of limit cycles due to linear instabilities is predicted. Further, the frequency response analysis is used to predict limit cycle frequencies in the case of predicted instability. The analysis predictions are compared with the results of tests performed at NETL, demonstrating a capability of replicating many of the observed stability characteristics.en
dc.description.degreePh. D.en
dc.identifier.otheretd-07262000-18360041en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07262000-18360041/en
dc.identifier.urihttp://hdl.handle.net/10919/28400en
dc.publisherVirginia Techen
dc.relation.haspartCAFannin2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecttime delayen
dc.subjectstabilityen
dc.subjectacousticen
dc.subjectheat releaseen
dc.titleLinear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustoren
dc.typeDissertationen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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