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摘要
The influence of curvature on smoke spreading in a curved tunnel fire was studied using FDS (Fire Dynamics Simulator) software . The aim of the study was to understand the correlation between the influence range and the degree of the tunnel curvature. A dimensionless was defined after the force analysis of smoke, which was the ratio centrifugal force to component of reaction force in the radical direction. The results show that the temperature and velocity outside lateral smoke near fire sources are higher than that inside. The difference decreases with the radius of tunnel curvature. Taking =0.1 as the critical value, and the corresponding radius of curvature is defined as the critical radius . The critical radius depends on the Heat Release Rate (HRR) and the downstream locations. The larger the HRR, the greater the critical radius. The farther the fire source is, the smaller the range of the effect is.
