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Experimental study on the effect of lateral concentrated smoke extraction on smoke stratification in the longitudinal ventilated tunnel

机译：横向浓缩烟雾提取对纵向通风隧洞施烟区的实验研究

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Smoke is the main cause of death in tunnel fires. It is one of the important measures to maintain smoke stratification in the early stage of tunnel fire. This article focused on experimentally studying the combined effect of lateral concentrated smoke extraction and longitudinal ventilation on the smoke stratification, which never be revealed before. The velocity of the smoke layer and air layer, vertical temperature distribution, and the flow patterns of the smoke were measured. It was found that the longitudinal ventilation and lateral concentrated smoke extraction would affect the flow of the smoke and change the shear velocity between the smoke layer and air layer, then, the patterns of the smoke layer will be affected. And the flow patterns with Froude (Fr) number can be classified into three categories: (a)Fr 0.6, with stable smoke stratification; (b)0.6 Fr 0.85, with a stable smoke stratification but the blurring interface; and (c)Fr 0.85, the smoke layer is completely unstable. The result can provide a reference for ventilation design of immersed tube tunnels.
机译：烟雾是隧道火灾死亡的主要原因。它是在隧道火灾早期维持烟雾分层的重要措施之一。本文专注于实验研究横向浓缩烟雾提取和纵向通风对烟雾分层的综合作用，从来没有透露。测量烟雾层和空气层，垂直温度分布和烟雾的流动图案的速度。结果发现，纵向通风和横向浓缩烟雾提取将影响烟雾的流动并改变烟雾层和空气层之间的剪切速度，然后，烟雾层的图案将受到影响。与Froude（FR）数量的流动模式可以分为三类：（a）fr <0.6，具有稳定的烟雾分层; （b）0.6 0.85，烟雾层完全不稳定。结果可以为浸入管隧道的通风设计提供参考。

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