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Critical ventilation velocity under the blockage of different metro train in a long metro tunnel
Fire and Materials ( IF 1.9 ) Pub Date : 2020-02-05 , DOI: 10.1002/fam.2804
Shaogang Zhang 1 , Long Shi 2 , Xianbin Li 1 , Yilong Huang 1 , Kun He 3 , Jinhui Wang 1
Affiliation  

To address the effect of metro train blockage on the critical ventilation velocity in a long tunnel, a series of scenarios were conducted numerically through this study, including different fire sizes (5‐10 MW), metro train lengths (80‐120 m), and blockage ratios (φ, 0.50, and 0.57). It is known from the numerical results that the metro train length shows a limited effect on the critical ventilation velocity, which is because the longitudinal ventilation has become stable before reaching the fire source to prevent smoke back‐layering, and increasing the metro train length only increases the distance of stabilizing the longitudinal ventilation. The blockage ratio shows an obvious influence on the critical ventilation velocity, which is because the presence of the metro train can obviously reduce the flow cross‐sectional area of the tunnel. An empirical model is developed as well, while it is known that the critical ventilation velocity increases with the one‐third power of dimensionless heat release rate and (1‐φ). The research outcomes of this study provide a technical guide for the design of the metro tunnel and the relevant emergency management of fire rescue under fire conditions.

中文翻译:

长地铁隧道中不同地铁列车堵塞下的临界通风速度

为了解决地铁列车阻塞对长隧道关键通风速度的影响,通过本研究对一系列情景进行了数值模拟,包括不同的火势(5-10 MW),地铁列车长度(80-120 m),和阻塞率(φ,0.50和0.57)。从数值结果可以看出,地铁长度对临界通风速度的影响有限,这是因为纵向通风在到达火源之前已经稳定,可以防止烟雾积聚,并仅增加地铁长度。增加了稳定纵向通风的距离。堵塞率对临界通风速度有明显影响,这是因为地铁列车的存在可以明显减小隧道的通流截面积。还建立了一个经验模型,但已知临界通风速度随无因次放热率和(1- φ)。这项研究的研究成果为地铁隧道的设计以及在火灾情况下的消防应急管理提供了技术指导。
更新日期:2020-02-05
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