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Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures
Four different numerical methods to calculate the upper flammability limit of methane/air mixtures at initial pressures up to 10 bar and initial temperatures up to 200 deg C are evaluated by comparison with experimental data. Planar freely propagating flames are calculated with the inclusion of a radiation heat loss term in the energy conservation equation to numerically obtain flammability limits. Three different reaction mechanisms are used in these calculations. At atmospheric pressure, the results of these calculations are satisfactory. At elevated pressures, however, large discrepancies are found. The spherically expanding flame calculations only show a marginal improvement compared with the planar flame calculations. On the other hand, the application of a limiting burning velocity with a pressure dependence Su,lim is proportional to p-1/2 is found to predict the pressure dependence of the upper flammability limit very well, whereas the application of a constant limiting flame temperature is found to slightly underestimate the temperature dependence of the upper flammability limit.
Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures
Four different numerical methods to calculate the upper flammability limit of methane/air mixtures at initial pressures up to 10 bar and initial temperatures up to 200 deg C are evaluated by comparison with experimental data. Planar freely propagating flames are calculated with the inclusion of a radiation heat loss term in the energy conservation equation to numerically obtain flammability limits. Three different reaction mechanisms are used in these calculations. At atmospheric pressure, the results of these calculations are satisfactory. At elevated pressures, however, large discrepancies are found. The spherically expanding flame calculations only show a marginal improvement compared with the planar flame calculations. On the other hand, the application of a limiting burning velocity with a pressure dependence Su,lim is proportional to p-1/2 is found to predict the pressure dependence of the upper flammability limit very well, whereas the application of a constant limiting flame temperature is found to slightly underestimate the temperature dependence of the upper flammability limit.
Calculation of the upper flammability limit of methane/air mixtures at elevated pressures and temperatures
Van den Schoor, F. (author) / Verplaetsen, F. (author) / Berghmans, J. (author)
Journal of Hazardous Materials ; 153 ; 1301-1307
2008
7 Seiten, 8 Bilder, 3 Tabellen, 24 Quellen
Article (Journal)
English
Entflammbarkeit , Konzentrationseinfluss , Methan , Luft , Gasgemisch , Hochdruck (Mechanik) , Hochtemperatur , Temperatureinfluss , Druckeinfluss , numerisches Verfahren , Flammausbreitung , Energiebilanz , Energieverlust , Reaktionsmechanismus , Reaktionskinetik , Flammausbreitungsgeschwindigkeit , chemische Zusammensetzung , Flammentemperatur
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