This article is cited in 27 papers

On the nature of superadiabatic temperatures in premixed rich hydrocarbon flames

V. V. Zamashchikov, I. G. Namyatov, V. A. Bunev, V. S. Babkin

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

Abstract: The propagation of flat laminar flames is studied numerically. It is shown that in rich homogeneous propane–air and methane–air mixtures, the maximum flame temperature exceeds the flame temperature in thermodynamic equilibrium. The degree of superadiabaticity depends on the concentration of the fuel mixed with air. It is shown that the superadiabaticity of rich flames is due to the diffusion of hydrogen from the reaction zone to the preheating zone and its preferential (compared to hydrocarbon) oxidation. The total enthalpy of the gas varies along the coordinate at the flame front and has a maximum.

Keywords: superadiabaticity of gas flames, hydrocarbon flames, diffusion processes in flame, rich flammability limits.

UDC: 536.46

Received: 14.02.2003
Accepted: 14.07.2003

 English version: Combustion, Explosion and Shock Waves, 2004, 40:1, 32–35

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