Experimental analysis of lean flammability limits of methane-air premixed flames.

概要

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Burning velocity of spherically propagating methane-air premixed flames was measured by a shadow-graph method under an isobaric condition; the flames were investigated in the vicinity of the lean flammability limits and at various initial temperatures ranging from room temperature and about 300°C. The obtained conclusions are summarized as follows: (1) the flames containing less than 4.18 % in fuel at room temperature and 3.87 % at 275°C, for example, could not expand up to 80mm in diameter; (2) an empirical formula was derived for the relation of the burn ing velocity with the methane concentration and the initial temperature; (3) the para-meters involved in the formula were analyzed from the chemical point of view, and the analyses derived a critical temperature below which the flames cannot propagate be-cause of insufficient production of oxygen atoms which are indispensable for the methane combustion reactions proceeding sequentially.
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