Study of propagation of harmful factors of fire in short road tunnels with different inclinations

The paper considers the spread of combustion products caused by fires with different heat release rates: 5, 10, 15, 20, 30, 50 MW in up to 400 m long tunnels. slope tunnels on numerical models is - 0, 1, 3, 7, 9%. cross-sectional area tunnel 42.5m 2 . describes dynamic variability damaging factors “chimney effect” such as carbon monoxide and temperature. Modeling was done FDS software using finite volume method. time process modeling 180 s. minimum cell size 0.25x 0.25 x 0.25m. hearth fire central part tunnel. obtained results are given plane longitudinal section boundary condition an increment pressure height difference between portals normal conditions. dependence fire-induced backlayering distance rate inclination studied. theoretical those velocity analyzed compared. locations high-risk for each factor along identified. Their quasi-stationary nature described intervals transient processes typical determined course modeling. It advisable use respond emergencies relevant