Abstract
The number of urban road tunnels which had effect ventilation to remove smoke from tunnel fire had increased in China. In this paper, a 3D numerical simulation model of urban road tunnel fire was developed to investigate the impact of block transportation on buoyancy flows. The heat release rate(HRR) is 10MW, 20mw, 40mw when the Fire Dynamic Simulation(FDS6.0) is used. The results of FDS simulations showed that the effect of longitudinal velocity on flame length(Lf) should not be ignored when the velocity is small in the models with small Br. Longitudinal ventilation promote combustion to some extent, when the velocity is less than 1.0m/s. Temperature of car behind fire source with a 10MW HRR is not too high to reach the ignition point of car when the distance between vehicles is 5m, but it is still too high for rescue. It is concluded that the temperature distribution is related to the longitudinal blockage. Further studies are needed to analysis the temperature of downstream car to avoid a second fire.
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