Dynamic-Stability Characteristics of Premixed Methane Oxy-Combustion
KAUST Grant NumberKUS-110-010-01
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AbstractThis 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.
CitationShroll AP, Shanbhogue SJ, Ghoniem AF (2012) Dynamic-Stability Characteristics of Premixed Methane Oxy-Combustion. Journal of Engineering for Gas Turbines and Power 134: 051504. Available: http://dx.doi.org/10.1115/1.4004737.
SponsorsThis research was supported by a grant from King Abdullah University of Science and Technology (KAUST), Grant No. KUS-110-010-01.