@Article{fdmp.2020.09631,
AUTHOR = {Li Lei, Wukai Chen, Huiling Li, Shuai Shi},
TITLE = {Numerical Simulation of Fire-Smoke Diffusion Caused by Vehicles in a Tunnel},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {16},
YEAR = {2020},
NUMBER = {5},
PAGES = {837--856},
URL = {http://www.techscience.com/fdmp/v16n5/40290},
ISSN = {1555-2578},
ABSTRACT = {Urban tunnels are generally narrow and fire smoke can hardly diffuse.
In the present study, numerical simulation is used to analyze the diffusion of high
temperature smoke produced by fire inside a specific tunnel (the Kaiyuan tunnel).
The results are compared with similar data relating to other tests to determine the
validity of the numerical method. Moreover, the critical velocity obtained by
numerical simulation of 5 MW, 20 MW, and 50 MW fires in curved and linear
sections of the considered tunnel is compared with the values obtained using
empirical formulas. The results show that, for the tunnel ventilation design, it is
necessary to consider the fan pressurization at different sections and the fan pressurization should be higher at curved sections than that at linear sections. The
safety of personnel escaping under different critical velocity values in the linear
section has also been considered. On the basis of our findings, if only relying
on natural ventilation, people can escape safely for the case of small fires, whereas
for medium and large fires, it is necessary to turn on mechanical ventilation in
time (and in order to avoid the danger caused by rapid diffusion of smoke, the
timing of mechanical ventilation should be carefully tuned).},
DOI = {10.32604/fdmp.2020.09631}
}