The use of chemiluminescence for detection of ignition, temperature, and fuel-to-air ratio of flames

dc.contributor.authorJohnsson, Erik L.en
dc.contributor.committeememberRoby, Richard J.en
dc.contributor.committeememberO'Brien, Walter F. Jr.en
dc.contributor.committeememberRoe, Larry A.en
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:35:21Zen
dc.date.adate2009-05-02en
dc.date.available2014-03-14T21:35:21Zen
dc.date.issued1991-02-05en
dc.date.rdate2009-05-02en
dc.date.sdate2009-05-02en
dc.description.abstractA fast response method for detection of ignition and extinction of liquid spray flames has been improved. Also, a method of determining fuel-to-air ratios and temperatures of pre-mixed, gaseous flames has been developed. Both methods utilize chemiluminescent signals from an OH system centered at 309 nm and a CH system centered at 431 nm. The ignition and extinction method was improved by replacing an optical system composed of lenses and a monochromator by a system composed of a fiber optic cable and band pass interference filters. The use of a solid-state photodiode instead of a photomultiplier tube was investigated. Transient histories of the OH and CH signals were recorded by performing light-off ignition and intermittent ignition flame tests. These signal histories were compared to histories obtained using the original apparatus. The fuel-to-air ratio and temperature detection method was investigated by recording the spectra of laminar, pre-mixed methane flames of known stoichiometry with a lens, monochromator, and photomultiplier tube set-up and measuring the flame temperatures with a high-temperature Pt-10%Rh thermocouple. Various combinations of signal characteristics were found to be functions of fuel-to-air ratio and temperature. Optimum signals for monitoring with a detector were determined. Recommendations for future work in this area are discussed.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 124 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-05022009-040621en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05022009-040621/en
dc.identifier.urihttp://hdl.handle.net/10919/42410en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.J656.pdfen
dc.relation.isformatofOCLC# 23810460en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.J656en
dc.subject.lcshChemiluminescenceen
dc.subject.lcshFlameen
dc.titleThe use of chemiluminescence for detection of ignition, temperature, and fuel-to-air ratio of flamesen
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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