Flames propagating down paper cylinders under varying oxygen levels in an atmosphere-controlled box were found to extinguish, or the flames failed to ignite, at oxygen concentrations of about 18%; this limit was also substantially insensitive to cylinder diameter although the flame speed was not. This oxygen extinction limit is not known to have been previously reported for such diffusion flames. Changes in oxygen level were (mainly) obtained by nitrogen dilution. Over the cylinder diameters studied (0.5i to 2.5i), flame speed otherwise increased with diameter in agreement with earlier experimental studies and prediction by CV analysis.
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