Abstract
The flame propagating along the interface between a layer of methane and air has been investigated using two techniques. With a flame propagating along a layer, the flame speed was constant at 6 ft/sec, and the volume of flame depended on the total quantity of methane present and its distribution in the layer. The flame speed has been related to the burning velocity of a stoichiometric premixed flame, by observing the movements of gas immediately ahead of the flame front. Flame speed was constant except when the radius of the advancing flame front was very small. In both series of experiments, the flame zone could be divided into three regions, a premixed flame propagating through the 5% to 15% methane mixture, a diffusion flame separating the methane-rich from the air-rich combustion products, and a convection flame, where the flame shape is controlled by displacement of methane by the buoyant combustion products.
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