TY - JOUR
T1 - Dynamic-Stability Characteristics of Premixed Methane Oxy-Combustion
AU - Shroll, Andrew P.
AU - Shanbhogue, Santosh J.
AU - Ghoniem, Ahmed F.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-110-010-01
Acknowledgements: This research was supported by a grant from King Abdullah University of Science and Technology (KAUST), Grant No. KUS-110-010-01.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2012/3/1
Y1 - 2012/3/1
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/598031
UR - https://asmedigitalcollection.asme.org/gasturbinespower/article/doi/10.1115/1.4004737/477100/DynamicStability-Characteristics-of-Premixed
UR - http://www.scopus.com/inward/record.url?scp=84858629144&partnerID=8YFLogxK
U2 - 10.1115/1.4004737
DO - 10.1115/1.4004737
M3 - Article
SN - 0742-4795
VL - 134
JO - Journal of Engineering for Gas Turbines and Power
JF - Journal of Engineering for Gas Turbines and Power
IS - 5
ER -