Seven additives in 0.5-volume-percent concentration were studied for their effects on the low-pressure limits of flame propagation of propane-air mixtures. The limits were measured in a flame tube of new design. Mixtures containing approximately 2 to 8 percent propane by volume were studied. The limit curves were without lobes on the rich side and were closely related to quenching-distance data measured by the flash-back of a Bunsen flame.nThe data were analyzed by means of the experimental curves and the Le Chatelier law governing the flammability limits of mixed fuels.
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