Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 136, Issue -, Pages 230-242Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2018.10.041
Keywords
Tunnel fire; Thermal stratification; Vehicular obstruction; Longitudinal imposed airflow; FDS
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This paper is focused on the thermal buoyant flow stratification, generated by fire that occurred in a tunnel congested by an obstacle simulating a vehicle. The obstacle occupies about 0.31% of the tunnel cross section and is located at different distances from the floor. This case is considered for two main reasons: the first is that the remaining vehicles blocked upstream of the heat source cause a partial obstruction, the second reason is that the vehicle bottom actually has a certain distance from the tunnel floor. The obtained results showed that the increase of the forced airflow velocity has for results a loss of stratification. The obstruction existence effect in tunnel is reflected by smoke flow destratification upstream of the heat source fire. However, this effect is compensated downstream of the fire and there has been an improvement in the smoke flow stratification contrary to the case where the tunnel would be empty.
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