This article is cited in 3 papers

Role of atomic hydrogen diffusion in a hydrogen flame

V. A. Bunev, V. N. Panfilov, V. S. Babkin

Institute of Chemical Kinetics and Combustion, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090

Abstract: A numerical modeling study of the propagation of a laminar flat homogeneous gas flame has shown that in a hydrogen-air flame, a rapid increase in the concentration of OH radicals begins in the range of low temperatures and the concentration profile has two maxima. The first maximum in the low-temperature region of the front is related to the diffusion of H atoms, formation of HO$_2$ radicals, and the quadratic branching reaction H + HO$_2$ $\to$ OH + OH. The second maximum in the OH concentration profile is due to the classical high-temperature branching reactions H + O$_2$ $\to$ OH + O and O + H$_2$ $\to$ OH + H.

Keywords: chain avalanche, flame propagation, diffusion, hydrogen atoms, quadratic branching.

UDC: 536.46

Received: 21.12.2005

 English version: Combustion, Explosion and Shock Waves, 2007, 43:2, 125–131

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