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Design and Validation of a High-Bandwidth Fuel Injection System for Control of Combustion Instabilities

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dc.contributor.authorDeCastro, Jonathan Anthonyen
dc.contributor.committeechairSaunders, William R.en
dc.contributor.committeememberVandsburger, Urien
dc.contributor.committeememberLeo, Donalden
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T20:34:04Zen
dc.date.adate2003-05-06en
dc.date.available2014-03-14T20:34:04Zen
dc.date.issued2003-02-07en
dc.date.rdate2004-05-06en
dc.date.sdate2003-04-23en
dc.description.abstractThe predictive design of fuel injection hardware used for active combustion control is not well established in the gas turbine industry. The primary reason for this is that the underlying mechanisms governing the flow rate authority downstream of the nozzle are not well understood. A detailed investigation of two liquid fuel flow modulation configurations is performed in this thesis: a piston and a throttle-valve configuration. The two systems were successfully built with piezoelectric actuation to drive the prime movers proportionally up to 800 Hz. Discussed in this thesis are the important constituents of the fuel injection system that affect heat release authority: the method of fuel modulation, uncoupled dynamics of several components, and the compressibility of air trapped in the fuel line. Additionally, a novel technique to model these systems by way of one-dimensional, linear transmission line acoustic models was developed to successfully characterize the principle of operation of the two systems. Through these models, insight was gained on the modes through which modulation authority was dissipated and on methods through which successful amplitude scaling would be possible. At high amplitudes, it was found that the models were able to successfully predict the actual performance reasonably well for the piston device. A proportional phase shifting controller was used to test the authority on a 40-kW rig with natural longitudinal modes. Results show that, under limited operating conditions, the sound pressure level at the limit cycle frequency was reduced by about 26 dB and the broadband energy was reduced by 23 dB. Attenuation of the fuel pulse at several combustor settings was due to fluctuating vorticity and temporal droplet distribution effects.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-04232003-153301en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-04232003-153301/en
dc.identifier.urihttp://hdl.handle.net/10919/31839en
dc.publisherVirginia Techen
dc.relation.haspartETD_Jon_DeCastro.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectlean premixeden
dc.subjectpiezoceramic actuatoren
dc.subjectthermoacoustic instabilitiesen
dc.subjectcompressibilityen
dc.subjectatomizationen
dc.subjectfuel modulationen
dc.titleDesign and Validation of a High-Bandwidth Fuel Injection System for Control of Combustion Instabilitiesen
dc.typeThesisen
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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