Numerical study of fire spread over the forest fuel

O. P. Korobeinichev^a, A. A. Shaklein<sup>b

a</sup> Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
^b Institute of Mechanics, Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia

Abstract: We developed a mathematical model of flame spread over porous combustible medium taking into account main physical and chemical processes. In order to predict heterogeneous system processes deep interaction, a computational algorithm based on a coupled formulation of the «gas phase-solid body of porous bed» system had been created. We carried out numerical simulations of the flame spread over porous medium bed and obtained qualitative estimations of flame spread general parameters. Gas and pine temperature distributions reveal heating process of pine needle bed far away from the flame zone, showing the important role of the radiative heat transfer. The flame zone takes «$\Lambda$»-shape because of diffusion combustion regime, leading to formation of distinct hot spot at the pine needle bed surface.

Keywords: fire spread, porous combustible medium, forest fire, diffusion combustion, radiative heat transfer.

UDC: 544.4+536.2+532+519.6