STUDY OF TEMPERATURE CONDITIONS DURING FIRES IN CABLE TUNNELS

The aim of this study is to determine the temperature regime of a fire in a cable tunnel depending on its shape, size, and fire load. Mathematical models of cable tunnels were created in one of the CFD software packages. Computational experiments were carried out and the temperature regimes of fires in tunnels with different parameters were determined. The temperature regimes of fires in cable tunnels with different sizes, aerodynamic parameters and fire loads were determined, as well as the dependence of the fire temperature regime on these parameters. With 10 laid cable lines and a fire load of 2000 MJ/m2 , the maximum temperature exceeded 1200 ̊С, with 1 line and a fire load of 688 MJ/m2 - 500 ̊С. With the smallest cross-sectional area of the tunnel and reduced airflow velocities, the temperature inside rises 50% faster than average. In addition, an excess of fresh air reduces the combustion temperature by 50-70°C, although it also contributes to the faster spread of fire along the cable lines. In this work, the use of computational experiments to study the processes of heat and mass transfer during fires in cable tunnels was further developed.