Influence of upstream blockage on smoke control in tunnel fires

IF 3.4 3区工程技术 Q2 ENGINEERING, CIVIL

Fire Safety Journal Pub Date : 2024-07-01 DOI:10.1016/j.firesaf.2024.104197

Ying Zhen Li, Haukur Ingason

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引用次数: 0

Abstract

Smoke control in a longitudinally ventilated tunnel with various blockage conditions was investigated experimentally. A total of 28 tests were conducted with a focus on single blockage with a short distance from the fire source, although continuous blockage and semicontinuous blockage were also discussed. Both gas and pool fires were used. The aim was to understand the influence of upstream blockage on critical velocity and babcklayering length. The results confirm that blockage ratio is a critical parameter when determining the critical velocity and backlayering length. The longitudinal location of the blockage in relation to the fire source also influences the values of critical velocity and backlayering length. The experiments presented are in scale 1 to 3.3, representing a medium sized tunnel. The focus was on free flow conditions and blockage ratios of regular sizes. For the various tested scenarios with single blockage, the reduction ratio of critical velocity appears to be slightly less than the blockage ratio. However, when the blockage is attached to the upstream side of the fire source, the reduction ratio of critical velocity approximately equals the blockage ratio.

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上游堵塞对隧道火灾烟雾控制的影响

实验研究了各种堵塞条件下纵向通风隧道的烟雾控制情况。共进行了 28 次测试，重点是与火源距离较近的单一阻塞，但也讨论了连续阻塞和半连续阻塞。试验中使用了气火和池火。目的是了解上游堵塞对临界速度和 babcklayering 长度的影响。结果证实，在确定临界速度和背层长度时，阻塞率是一个关键参数。堵塞物相对于火源的纵向位置也会影响临界速度和背压长度的值。所展示的实验规模为 1 到 3.3，代表了一个中等规模的隧道。重点是自由流动条件和规则尺寸的堵塞率。在单个堵塞物的各种测试方案中，临界速度的降低率似乎略低于堵塞率。然而，当堵塞物附着在火源的上游侧时，临界速度的降低率近似等于堵塞率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Fire Safety Journal 工程技术-材料科学：综合

CiteScore

5.70

自引率

9.70%

发文量

153

审稿时长

60 days

期刊介绍： Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.