This paper discusses the effect of introducing solid barriers at the ceiling of a tunnel on slowing down propagation of smoke resulted from a fire using numerical simulations. Significant reduction of smoke spread and great enhancement of visibility conditions in the tunnel were achieved using solid barriers with specific design arrangements including the dimensions and number of solid barriers used. Using solid barriers with a height of 1 m and with a 5 m distance between two successive solid barriers resulted in the reduction of the total smoke spread distance by 66.5 % compared to the case without using solid barriers for a 30 MW fire. Results referred to that smoke layer thickness increases and also the temperature increases at specific regions close to the fire location when using solid barriers but with various degrees depending on number and geometry of the solid barriers. Findings of this paper confirm the advantages of using solid barriers and open the way for future research towards developing more knowledge on smoke barriers performance.

本文讨论了在隧道天花板上引入固体屏障对减缓火灾产生的烟雾传播的影响，使用数值模拟。使用具有特定设计安排的固体屏障，包括所用固体屏障的尺寸和数量，显着减少了烟雾扩散并大大提高了隧道内的能见度条件。与在 30 MW 火灾中不使用固体屏障的情况相比，使用高度为 1 m 且两个连续固体屏障之间距离为 5 m 的固体屏障导致总烟雾传播距离减少了 66.5%。结果表明，当使用固体屏障时，烟层厚度增加，靠近火灾位置的特定区域的温度也会升高，但程度不同，取决于固体屏障的数量和几何形状。本文的发现证实了使用固体屏障的优势，并为未来的研究开辟了道路，以开发更多关于烟雾屏障性能的知识。