The concentrations of methyl bromide required to extinguish fuel + air diffusion flames have been determined and its effect on the structure of these flames studied spectroscopically. It was found that the concentration of methyl bromide required in the air to extinguish the flame was of the same order as for the pre-mixed flame, but considerably higher concentrations were required in the fuel. The structure of diffusion flames was drastically altered by the addition of methyl bromide. When added to the air an extra reaction zone forms on the air side in which the methyl bromide reacts, and the quenching of the flame involves an interaction of this extra zone and the main reaction zone. When methyl bromide is added to the fuel, carbon formation is greatly increased, and hydrogen and carbon monoxide flames obtain the appearance of hydrocarbon flames.The effect of methyl bromide and bromine on pre-mixed flames has been described in part 1,1 and its effect on diffusion flames is described in the present paper. Probably the main conclusion which arises from the work described in part 1 is that the action of methyl bromide in pre-mixed flames can be explained in terms of the addition of both inhibitor and additional fuel, and it will be seen that this is also true for diffusion flames. The investigation on diffusion flames consists firstly of a study of the concentrations of methyl bromide required to extinguish diffusion flames, and secondly, a spectrographic investigation.
EXPERIMENTAL DETERMINATION OF CRITICAL CONCENTRATIONS OF METHYL BROMIDE
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