| Issue |
E3S Web Conf.
Volume 194, 2020
2020 5th International Conference on Advances in Energy and Environment Research (ICAEER 2020)
|
|
|---|---|---|
| Article Number | 05061 | |
| Number of page(s) | 6 | |
| Section | Environmental Engineering, Ecological Environment and Urban Construction | |
| DOI | https://doi.org/10.1051/e3sconf/202019405061 | |
| Published online | 15 October 2020 | |
Numerical study on the effect of shaft position on natural smoke exhaust in tunnels with one closed portal
1 School of Civil Engineering, Chongqing University, Chongqing 400045, China.
2 College of Environment and Ecology, Chongqing University, Chongqing, 400045, China.
3 Key Laboratory of The Three Gorges Reservoir Region’s Eco-Environment, Ministry of Education, Chongqing 400045, China.
* Corresponding author: drliufang@126.com; mcweng@126.com
.This paper uses Fire Dynamics Simulator (FDS) to study the effect of the longitudinal distance from the shaft to the fire source on the natural smoke exhaust of the tunnel fire with one closed portal, and analyzes the temperature distribution of the smoke and the shaft’s smoke exhaust efficiency. The results show that when the shaft is located downstream of the fire source (Ds<0), with the increase of the distance from the shaft to the fire source, the smoke exhaust efficiency decreases first and then stabilizes at a fixed value. At this time, the ceiling temperature attenuation’s coefficient at upstream of the fire source is only related to the heat release rate of the fire source (HRR). When the shaft is located upstream of the fire source (Ds>0), the smoke exhaust efficiency increases slightly with the increase of the distance from the shaft to the fire source, but the overall value is relatively small. When HRR is fixed, the shaft located downstream of the fire source has a higher smoke exhaust efficiency. As the distance between the shaft and the fire source increases, the plug phenomenon decreases.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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