Experimental study on temperature profile and smoke movement in a model-branched tunnel fire under longitudinal ventilation

2022 ◽  
Vol 121 ◽  
pp. 104324
Author(s):  
Dongyue Zhao ◽  
Changkun Chen ◽  
Peng Lei ◽  
Tong Xu ◽  
Weibing Jiao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Temperature Profile ◽  
Smoke Movement ◽  
Tunnel Fire ◽  
Longitudinal Ventilation

An Experimental Study of Smoke Movement in Tunnel Fire with Natural and Forced Ventilations

2005 ◽  
Vol 29 (6) ◽  
pp. 711-721 ◽  
Author(s):  
Cheol-Hong Hwang ◽  
Byung-Hun Yoo ◽  
Sung-Min Kum ◽  
Jung-Yup Kim ◽  
Hyun-Joon Shin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Smoke Movement ◽  
Tunnel Fire

Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

2019 ◽  
Vol 29 (7) ◽  
pp. 1017-1027
Author(s):  
Guanfeng Yan ◽  
Mingnian Wang ◽  
Li Yu ◽  
Yuan Tian
Keyword(s):  
Heat Release ◽  
High Altitude ◽  
Critical Velocity ◽  
Heat Release Rate ◽  
Release Rate ◽  
Ambient Pressure ◽  
Smoke Movement ◽  
Tunnel Fire ◽  
Longitudinal Ventilation ◽  
High Altitude Area

Nowadays, the critical velocity and back-layering length are the key parameters in longitudinal ventilation design. However, most studies research them at standard air pressure but ambient pressure decreases at high-altitude area and the reduced ambient pressure could affect the smoke movement characteristics in a tunnel fire. In order to investigate the effect of ambient pressure on the velocity and back-layering length in longitudinal ventilated tunnel, theoretical analysis was carried out first and a series of numerical simulation were conducted with varying heat release rate and ambient pressure. Results show that Li’s model is also reliable under various ambient pressures. The critical velocity under various ambient pressures would become larger with an increase in the heat release rate and would remain stable after the heat release rate reaches a certain value. At smaller heat release rate, the length of counterflow would be higher under reduced ambient pressure while it remains the same when the HRR is large. This could provide reference for tunnel ventilation design at high-altitude areas.

Experimental Study on Effect of Longitudinal Ventilation Velocity and Slope on Smoke Movement in Tunnels

2012 ◽  
Vol 256-259 ◽  
pp. 1381-1387
Author(s):  
Xue Fei Xing ◽  
Jing Yan Zhang ◽  
Yan Feng Li
Keyword(s):  
Experimental Study ◽  
Small Scale ◽  
Fire Prevention ◽  
Smoke Movement ◽  
Diffusion Velocity ◽  
Longitudinal Ventilation ◽  
Numerical Fitting ◽  
Fire Experiments ◽  
Ventilation Velocity

The slope effects on the movement of internal smoke cannot be ignored. Fire experiments in a small scale tunnel are conducted in order to observe the smoke movement in a tunnel with three kinds of slope (0%, 3% and 5%) under different longitudinal ventilation velocity, then find the correlation between smoke diffusion velocity and longitudinal ventilation velocity, and slope in tunnel by numerical fitting and dimensional analyses, finally conclude:(1) as longitudinal ventilation velocity increases, smoke diffusion velocity gradually decreases; (2) when longitudinal ventilation velocity is smaller, with the increase of slope, smoke diffusion velocity is gradually increasing; (3) when longitudinal ventilation velocity is large, slope to smoke diffusion velocity is not affected. These quantitative conclusions provide fire Prevention of the tunnel in city with a reference.

COMPARISON BETWEEN LONGITUDINAL VENTILATION SYSTEM AND POINT EXTRACTION SYSTEM IN ROAD TUNNEL FIRE SAFETY

2021 ◽  
Vol 77 (1) ◽  
pp. 41-59
Author(s):  
Ti-Sheng HUANG ◽  
Nobuyoshi KAWABATA ◽  
Miho SEIKE ◽  
Masato HASEGAWA ◽  
Futoshi TANAKA ◽  
...  
Keyword(s):  
Fire Safety ◽  
Ventilation System ◽  
Extraction System ◽  
Road Tunnel ◽  
Tunnel Fire ◽  
Longitudinal Ventilation
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