Verification of temperature and toxic species in methane compartment fire using flamelet generated manifold with radiation effect

Abstract

This paper examined the effect of combustion model on compartment fire simulation. The results of the flamelet generated manifold (FGM) combustion model were compared with conventional combustion models in compartment fire simulation. Methane fuel was selected and the detailed kinetic mechanism was chosen for the FGM model. In addition, the radiation effect was investigated on the FGM combustion model. It was observed that it was necessary to apply the radiation effect in the FGM combustion model for the high heat release rate. For example, the temperature of FGM-base (in the absence of radiation effect) over-predicted near the ceiling of the room at heat release rate of 265 kW. However, if radiation effect was applied, the mean temperature reached 1250 K and the relative error was reduced to less than 10%. The important point is that the computational cost of the FGM was equal to other conventional combustion models in fire simulation. In addition, the conventional combustion models could model only one or two toxic species. However, the FGM was able to model all toxic species involved in the fire.