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- W1982605664 abstract "Autoignition temperatures of the binary mixtures methane+ethane and methane+n-butane in air were measured at atmospheric pressure in a 0.56 dm3 spherical reaction vessel. The method followed that for standard ASTM and BS tests for gaseous fuels. Fixed proportions by volume of the total fuel in air were studied, which corresponded at the extreme of each composition range for methane, ethane and butane to the equivalence ratios of =0.93, 1.63 and 3.04 respectively. Supplementary experiments were carried out on n-butane alone in air in the range 0<<3.04. The autoignition temperature (Ta,cr) in binary mixtures was reduced by 40 K from that for pure methane (Ta,cr=900 K) when ethane was present at up to 10% of the total fuel. Similar proportions of butane added to methane caused Ta,cr to be decreased by 90 K. The effects were not linearly dependent on the proportion of additive. There was an additional sensitive region when n-butane was present in the proportion 50–70% of the methane/butane mixture. The autoignition temperatures of mixtures containing n-butane alone matched very closely the autoignition temperatures of the equivalent methane/butane compositions except at the leanest mixtures (butane<0.5). Numerical simulations of spontaneous ignition based on a comprehensive kinetic model yielded predicted autoignition temperatures that were in very satisfactory agreement with the measured values throughout all ranges of composition. The same regions of high sensitivity to composition change were distinguished. Alkylperoxy isomerisation and decomposition reactions were found to control the reactivity of butane at the lowest temperatures. Reactions of dialkylperoxy radicals seemed not to be especially important. The rates of H atom abstraction by OH governed the relative reactivity of methane to that of butane. The competition by methane for OH radicals caused a small retarding effect on the overall rate of butane oxidation." @default.
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- W1982605664 date "1991-01-01" @default.
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- W1982605664 title "Auto-ignition temperatures of binary mixtures of alkanes in a closed vessel: Comparisons between experimental measurements and numerical predictions" @default.
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- W1982605664 doi "https://doi.org/10.1016/s0082-0784(06)80452-2" @default.
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