PHYSICAL AND MATHEMATICAL SIMULATION OF FIRE EXTINGUISHING IN THE CABLE TUNNEL WITH USING OF INERT GASES

Abstract

The model which deals with dividing of fire area on two parts (the fire bed and the rest of the isolated volume) is performed. It simplifies the scientific task and allows us to consider the processes of heat transfer in each zone separately. A numerical method for solving an equations system of the temperature and oxygen concentration change dynamics in each zone is proposed. It allows taking into account the expanding and
compressibility of gases. The mathematical simulation of fire extinguishing with inert gases with subsequent recirculation inside and outside the combustion zone is made. Experimental study of fire extinguishing in small chambers with geometric similarity criterion 1.4 using nitrogen and carbon dioxide was made. The adequacy of mathematical simulation for small-scale and large-scale object fires and their suppression with inert gases followed by recirculation of combustion products is proved.