On the Fire Temperature Variation and Flue Gas Diffusion in Two-hole One-way Tunnel Based on FDS
In order to deal with the occurrence of tunnel fire and avoid unnecessary casualties and property losses,it is of great research value to analyze the temperature change and the characteristics of flue gas diffusion in the tun-nel,and select the appropriate longitudinal wind speed and flue gas diffusion control scheme.Therefore,PyroSim software is used to establish a highway tunnel model for FDS numerical simulation.The fire with the maximum heat release power of 20 MW was simulated,and the critical wind speed of 3.5 m/s was determined by observing the counter-current length of the flue gas under three different longitudinal ventilation intensity.Under three different longitudinal winds,based on the change of temperature field in the tunnel during fire,the characteristics of flue gas diffusion,and the impact of personnel evacuation and fire rescue,it is very important to determine the proper longi-tudinal ventilation intensity of the main and auxiliary tunnels in order to prevent the flue gas from spreading to the auxiliary tunnels through the cross passage and affecting the evacuation of personnel in the simulation of tunnel flue gas control scheme.
Safety engineeringTwo-hole one-way tunnelFDSFire ventilationFlue gas diffusion
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