Study on the maximum temperature and temperature decay in single-side centralized smoke exhaust tunnel fires

2022 ◽  
Vol 172 ◽  
pp. 107277
Author(s):  
Liangliang Tao ◽  
Yanhua Zeng ◽  
Jie Li ◽  
Guichang Yang ◽  
Yong Fang ◽  
...  
Keyword(s):  
Maximum Temperature ◽  
Tunnel Fires ◽  
Temperature Decay ◽  
Single Side

The maximum temperature of buoyancy-driven smoke flow beneath the ceiling in tunnel fires

2011 ◽  
Vol 46 (4) ◽  
pp. 204-210 ◽  
Author(s):  
Ying Zhen Li ◽  
Bo Lei ◽  
Haukur Ingason
Keyword(s):  
Maximum Temperature ◽  
Tunnel Fires ◽  
Smoke Flow

Effect of blockage ratio on the maximum temperature under the ceiling in tunnel fires

2012 ◽  
Vol 31 (3) ◽  
pp. 245-257 ◽  
Author(s):  
Liming Li ◽  
Xudong Cheng ◽  
Yu Cui ◽  
Wenhui Dong ◽  
Zhibin Mei
Keyword(s):  
Maximum Temperature ◽  
Blockage Ratio ◽  
Tunnel Fires

scholarly journals A study on the temperature profile of bifurcation tunnel fire under natural ventilation

PLoS ONE ◽  
2022 ◽  
Vol 17 (1) ◽  
pp. e0262546
Author(s):  
Jianlong Zhao ◽  
Yanfeng Li ◽  
Junmei Li ◽  
Jiaxin Li
Keyword(s):  
Temperature Profile ◽  
Natural Ventilation ◽  
Prediction Models ◽  
Longitudinal Direction ◽  
Numerical Code ◽  
Maximum Temperature ◽  
Tunnel Fire ◽  
Fire Engineering ◽  
Temperature Decay ◽  
Fire Scenarios

This study simulated a series of bifurcation tunnel fire scenarios using the numerical code to investigate the temperature profile of bifurcation tunnel fire under natural ventilation. The bifurcation tunnel fire scenarios considered three bifurcation angles (30°, 45°, and 60°) and six heat release rates (HRRs) (5, 10, 15, 20, 25, and 30 MW). According to the simulation results, the temperature profile with various HRRs and bifurcation angles was described. Furthermore, the effects of bifurcation angles and HRRs on the maximum temperature under the bifurcation tunnel ceiling and the temperature decay along the longitudinal direction of the branch were investigated. According to the theoretical analysis, two prediction models were proposed. These models can predict a bifurcation tunnel fire’s maximum temperature and longitudinal temperature decay in the branch. The results of this study could be valuable for modelling a bifurcation tunnel fire and benefit the fire engineering design of bifurcation tunnels.

Numerical investigation on the smoke behaviour and longitudinal temperature decay in tilted tunnel fire with portal sealing

2021 ◽  
pp. 1420326X2110348
Author(s):  
Jiaxin Li ◽  
Yanfeng Li ◽  
Junmei Li ◽  
Quan Yang
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Temperature Rise ◽  
Ventilation System ◽  
Emergency Evacuation ◽  
Maximum Temperature ◽  
Tunnel Fire ◽  
Temperature Decay ◽  
Tunnel Portal

Blocking the tunnel portal is one strategy in railway tunnel firefighting. In order to evaluate the effect of tunnel portal sealing ratio on fire behaviour, Fire Dynamics Simulator (FDS) was used to simulate tilted tunnel fire with different slope angles varying from 0% to 5%, heat release rate varying from 10 to 50 MW and sealing ratios varying from 0% to 75%. Results show that the experimental data of the temperature distribution inside the tilted tunnel were in good agreement with the simulation results. Moreover, the ceiling temperature rise decreases along the tunnel with the increase of the tunnel portal sealing ratio at initial stage and then tends to stabilize because of less oxygen supply when the heat release rate is relatively large. The maximum temperature rise decays exponentially along the tunnel ceiling with distance. The current model for temperature decay beneath the tunnel ceiling was proposed to be modified by taking the tunnel entrance sealing ratio into account. The predictions by the modified model agree well with the experimental measurement. The results could provide practical information and knowledge in ventilation system design and emergency evacuation for inclined railway tunnels.

A numerical study on upstream maximum temperature in inclined urban road tunnel fires

2015 ◽  
Vol 88 ◽  
pp. 516-526 ◽  
Author(s):  
Jie Ji ◽  
Huaxian Wan ◽  
Kaiyuan Li ◽  
Jianyun Han ◽  
Jinhua Sun
Keyword(s):  
Numerical Study ◽  
Maximum Temperature ◽  
Road Tunnel ◽  
Urban Road ◽  
Tunnel Fires
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