Dynamic-Stability Characteristics of Premixed Methane Oxy-Combustion

Andrew P. Shroll, Santosh J. Shanbhogue, Ahmed F. Ghoniem

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

This work explores the dynamic stability characteristics of premixed CH 4/O 2/CO 2 mixtures in a 50 kW swirl stabilized combustor. In all cases, the methane-oxygen mixture is stoichiometric, with different dilution levels of carbon dioxide used to control the flame temperature (T ad). For the highest T ad's, the combustor is unstable at the first harmonic of the combustor's natural frequency. As the temperature is reduced, the combustor jumps to fundamental mode and then to a low-frequency mode whose value is well below the combustor's natural frequency, before eventually reaching blowoff. Similar to the case of CH 4/air mixtures, the transition from one mode to another is predominantly a function of the T ad of the reactive mixture, despite significant differences in laminar burning velocity and/or strained flame consumption speed between air and oxy-fuel mixtures for a given T ad. High speed images support this finding by revealing similar vortex breakdown modes and thus similar turbulent flame geometries that change as a function of flame temperature. Copyright © 2012 American Society of Mechanical Engineers.
Original languageEnglish (US)
JournalJournal of Engineering for Gas Turbines and Power
Volume134
Issue number5
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

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