Abstract

An approximate analytical approach to the estimation of the effectiveness of inhibitors on flame velocity and flame propagation limits was suggested for rich hydrogen−air mixtures. The method is based on a narrow reaction zone and the branched chain character of hydrogen oxidation. It is shown that the occurrence of the limits is due to the positive feedback between flame velocity and the amount of active centers of combustion terminated via an inhibitor. The method is proposed for the analysis of experimental data on the limits of flame propagation in hydrogen-air mixtures at 1 atm. The mechanism of the occurrence of the upper concentration limit at 1 atm taking into account heat losses in the termolecular recombination is also presented.

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