Study on Adaptability of Lateral Concentrated Smoke Exhausting Mode in Large-span Rectangular Tunnels

DOI

10.2991/iceesd-18.2018.248How to use a DOI?

Keywords

Large-span tunnel, rectangular tunnel, lateral concentrated exhaust, numerical simulation, adaptability of smoke exhausting

Abstract

Taking large-span rectangular underwater tunnel as the research objective, numerical calculation model of lateral concentrated smoke exhausting in rectangular underwater tunnel was established by FDS. The adaptability of lateral concentrated exhaust mode in tunnels of variable widths is obtained according to analysis of smoke distribution and smoke exhausting efficiency under different working conditions. The results are as follows: The increase of width results in the decrease of smoke exhausting efficiency. In the two-lane, uni-directional tunnel, the smoke exhausting efficiency is 83.38%; while that of six-lane, uni-directional tunnel is only 55.19%. The wind velocity is higher in the area near the lateral exhaust valves; and which is lower in the area far from the exhaust valves. The influence of wind velocity for lateral exhaust valves is limited. With the increase of width, the wind velocity of cross-section decreases dramatically. In a two-lane, uni-directional tunnel, the wind velocity of the right wall decreases by 32.03%, and that in six-lane, uni-directional tunnel decreases by 59.62%. For large-span rectangular tunnels of uni-directional four-lane or even wider ones, the lateral centralized exhaust mode shows poor adaptability.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zhengmao CAO
AU  - Xiao LIU
PY  - 2018/05
DA  - 2018/05
TI  - Study on Adaptability of Lateral Concentrated Smoke Exhausting Mode in Large-span Rectangular Tunnels
BT  - Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018)
PB  - Atlantis Press
SP  - 1361
EP  - 1367
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceesd-18.2018.248
DO  - 10.2991/iceesd-18.2018.248
ID  - CAO2018/05
ER  -