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- W2002912205 abstract "The ignition temperatures of methane-``air'' mixtures were investigated in a flow system as follows: (1) The spontaneous ignition temperature due to temperature alone was determined. (2) One of the inert gases was passed through a condensed discharge before joining the combustible gas and the change in ignition temperature noted. The individual gases were preheated to 500°C before mixing in the ignition tube which could be heated to any desired higher temperature. Ignition always occurred about 50 cm downstream from the spark chamber. The temperature at which the mixtures ignited was lower when pre-sparking was employed. The gases subjected to the spark were A, He, N2, O2. The difference between the spontaneous and pre-sparking ignition temperatures increased in the order named, being about 28°C for A and about 240°C for oxygen under the conditions of this investigation for a final mixture of 8 percent methane in ``air'' (ratio of oxygen to inert gas in final mixture being the same as in air). A post ignition phenomenon is described which is brought about by delaying the flow of the sparked oxygen for some time after cessation of the spark and then resuming the flow. Such delay times of 2½ minutes were observed. The species which cause ignition possess a long life and are rather easily removed by metal screens. It is shown that the results cannot be accounted for by nitric oxide, ozone, active nitrogen or active oxygen. It is concluded that electrically charged species or ions are responsible for the lowered ignition temperatures. A tentative explanation of the results is suggested. It is pointed out that in the ignition of combustible gas mixtures by direct action of a spark, the ions formed in the path of the spark, as well as the thermal energy liberated, play a responsible part in the ignition process." @default.
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- W2002912205 date "1933-01-01" @default.
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- W2002912205 title "The Influence of Ionization on the Ignition Temperature of Combustible Gases" @default.
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- W2002912205 doi "https://doi.org/10.1063/1.1749224" @default.
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