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坡度对内部烟气运动变化的影响不容忽视。本文采用小尺寸试验方法对具有坡度的隧道内火灾烟气运动情况进行了研究,观测了不同纵向通风风速下,坡度分别为0%,3%和5%的隧道内烟气的运动情况,并运用数值拟合及量纲分析找出隧道内烟气的扩散速度与纵向通风风速及坡度间的相关性,得出相应结论。定量化的结论为城市交通隧道的防灾设计提供了有价值的参考。
The effect of slope on the internal flue gas movement can not be ignored. In this paper, a small-scale test was used to study the smoke movement in a tunnel with a gradient. The movement of smoke in the tunnel with 0%, 3% and 5% gradient was observed under different longitudinal ventilation velocities. Using numerical and dimensional analysis to find the correlation between the diffusion speed of flue gas in the tunnel and the longitudinal ventilation wind speed and slope, the corresponding conclusions are drawn. The quantitative conclusion provides a valuable reference for disaster prevention design of urban traffic tunnels.