Experimental and Simulation Study on Double Fire Source Tunnels with Different Spacings

被引：0

作者：

Liu S.-T. ^{[1
]}

Zhao J.-L. ^{[1
,2
]}

Wei W.-B. ^{[1
]}

Cui X.-Y. ^{[1
,2
]}

Liu Q.-S. ^{[3
]}

机构：

[1] China Academy of Building Research, Beijing

[2] School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing

[3] Beijing Building Research Institute Corporation Limited of CSCEC, Beijing

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2022年 / 35卷 / 07期

关键词：

burning rate; double fire sources; longitudinal temperature distribution; numerical simulation; small-size test; tunnel engineering; tunnel fire;

D O I：

10.19721/j.cnki.1001-7372.2022.07.016

中图分类号：

学科分类号：

摘要：

To study the fire behavior of tunnels with dual fire sources, a dual-fire source oil pool fire experiment was carried out at different spacings. The characteristics of the flame combustion behavior and the longitudinal temperature distribution in the tunnel were studied. Meanwhile, the PyroSim numerical simulation (FDS) method was used to study the temperature distribution at the heights of 0.1 m and 0.15 m between the two fire sources inside the tunnel. The experimental results show that for a dual fire source fire in a tunnel, the burning rate is significantly affected by the distance between the fire sources. As the distance was increased from 2D to 8D, the burning rate decreased from 20.43 g·m-2·s-1 to 15.61 g·m-2·s-1, and became close to the burning rate of a single fire source. The flames were inclined toward each other during the combustion process, but the inclination angle gradually decreased with an increase in the distance from 18.3° to 13.7°. Owing to the mutual restriction between the two fire sources, the heat in the area between the fire sources continued to accumulate, and the temperature near the roof between the two fire sources was obviously higher. The temperature distribution was consistent with that of the far end of a single fire source, and the longitudinal temperature near the roof at the far end fire source of the dual fire sources showed an exponential decay law. The temperature attenuation factor gradually increased with an increase in the fire source distance. Numerical simulation results show that the temperature distribution between the two fire sources presents a "concave" distribution law. If the fire source is far away, the temperature drops rapidly and then gradually stabilizes, but the temperature in the stable interval is higher, which can cause injury to personnel. The distance between the two fire sources had a great influence on the temperature distribution between the fire sources. As the distance between the fire sources increased, the stable temperature in the area between the two fire sources gradually decreased, and therefore, the impact on the evacuation of people gradually decreased. The temperature distribution law between dual fire sources can provide a reference for the rescue of people trapped in the initial stages of a fire. © 2022 Xi'an Highway University. All rights reserved.

引用

页码：193 / 202

页数：9

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