Effects of platinum stagnation surface on the lean extinction limits of premixed methane/air flames at moderate surface temperatures

A stagnation flow reactor was used to study the effects of platinum on the lean flammability limits of atmospheric pressure premixed methane/air flames at moderate stagnation surface temperatures. Experimental and computational methods were used to quantify the equivalence ratio at the lean extincti...

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Bibliographic Details
Published in:Combustion and flame 2011-01, Vol.158 (1), p.139-145
Main Authors: Wiswall, J.T., Li, J., Wooldridge, M.S., Im, H.G.
Format: Article
Language:English
Subjects:
AIR
Applied sciences
ATMOSPHERIC PRESSURE
Catalytic combustion
COMBUSTION
Combustion. Flame
Computation
DILUTION
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Extinction
FLAME EXTINCTION
FLAMES
FLAMMABILITY
Flammability limits
FLOW RATE
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METHANE
PLATINUM
STAGNATION
Stagnation flow
STRAIN RATE
Surface temperature
SURFACES
TEMPERATURE RANGE 0400-1000 K
Theoretical studies. Data and constants. Metering
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Summary:A stagnation flow reactor was used to study the effects of platinum on the lean flammability limits of atmospheric pressure premixed methane/air flames at moderate stagnation surface temperatures. Experimental and computational methods were used to quantify the equivalence ratio at the lean extinction limit ( ϕ ext ) and the corresponding stagnation surface temperature ( T s ). A range of flow rates (57–90 cm/s) and corresponding strain rates were considered. The results indicate that the gas-phase methane/air flames are sufficiently strong relative to the heterogeneous chemistry for T s conditions less than 750 K that the platinum does not affect ϕ ext . The computational results are in good agreement with the experimentally observed trends and further indicate that higher reactant flow rates (>139 cm/s) and levels of dilution (>∼10% N 2) are required to weaken the gas-phase flame sufficiently for surface reaction to play a positive role on extending the lean flammability limits.
ISSN:0010-2180
1556-2921
DOI:10.1016/j.combustflame.2010.08.002