Abstract
Measurements are reported on nitrogen concentrations required to prevent downward propagation of hydrogen oxygen and methane oxygen flames in open tubes of 2.5 and 5.1 cm diameter. Limits plotted as functions of the fuel oxygen ratio show that quenching is most difficult the fuel-lean side for hydrogen flames and near stoichiometric for methane flames. Cellular patterns were observed near flammability limits, and near-limit flame speeds were measured. Results are interpreted mainly in terms of conductive losses from cellular flames since alternative mechanisms appear to produce qualitatively inconsistent predictions.
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