dc.contributor.author	Huang, Xinming	en
dc.contributor.committeechair	Baumann, William T.	en
dc.contributor.committeemember	VanLandingham, Hugh F.	en
dc.contributor.committeemember	Saunders, William R.	en
dc.contributor.committeemember	Kachroo, Pushkin	en
dc.contributor.committeemember	Vandsburger, Uri	en
dc.contributor.department	Electrical and Computer Engineering	en
dc.date.accessioned	2014-03-14T20:19:17Z	en
dc.date.adate	2001-11-30	en
dc.date.available	2014-03-14T20:19:17Z	en
dc.date.issued	2001-09-21	en
dc.date.rdate	2002-11-30	en
dc.date.sdate	2001-11-28	en
dc.description.abstract	Lean-premixed combustion has the advantage of low emissions for modern gas turbines, but it is susceptible to thermoacoustic instabilities, which can result in large amplitude pressure oscillations in the combustion chamber. The thermoacoustic limit cycle is generated by the unsteady heat release dynamics coupled to the combustor acoustics. In this dissertation, we focused on reduced-order modeling of the dynamics of a laminar premixed flame. From first principles of combustion dynamics, a physically-based, reduced-order, nonlinear model was developed based on the proper orthogonal decomposition technique and generalized Galerkin method. In addition, the describing function for the flame was measured experimentally and used to identify an empirical nonlinear flame model. Furthermore, a linear acoustic model was developed and identified for the Rijke tube experiment. Closed-loop thermoacoustic modeling using the first principles flame model coupled to the linear acoustics successfully reproduced the linear instability and predicted the thermoacoustic limit cycle amplitude. With the measured experimental flame data and the modeled linear acoustics, the describing function technique was applied for limit cycle analysis. The thermoacoustic limit cycle amplitude was predicted with reasonable accuracy, and the closed-loop model also predicted the performance for a phase shift controller. Some problems found in the predictions for high heat release cases were documented.	en
dc.description.degree	Ph. D.	en
dc.identifier.other	etd-11282001-190912	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-11282001-190912/	en
dc.identifier.uri	http://hdl.handle.net/10919/29763	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	Appendix.pdf	en
dc.relation.haspart	Chapter5.pdf	en
dc.relation.haspart	Chapter6.pdf	en
dc.relation.haspart	Chapter1.pdf	en
dc.relation.haspart	Chapter3.pdf	en
dc.relation.haspart	Bibliography.pdf	en
dc.relation.haspart	Frontmatter.pdf	en
dc.relation.haspart	Chapter7.pdf	en
dc.relation.haspart	Chapter2.pdf	en
dc.relation.haspart	Chapter4.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	limit cycle	en
dc.subject	combustion instability	en
dc.subject	reduced-order model	en
dc.subject	describing function	en
dc.title	Development of Reduced-Order Flame Models for Prediction of Combustion Instability	en
dc.type	Dissertation	en
thesis.degree.discipline	Electrical and Computer Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	doctoral	en
thesis.degree.name	Ph. D.	en

Development of Reduced-Order Flame Models for Prediction of Combustion Instability

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