Smoke extraction experiments in case of fire in a tunnel

Effect of Smoke Exhaust Openings Placement Direction of Tunnel Ceiling Mechanical Exhaust System

“…In this regard, some scholars studied the problem of smoke exhaust opening from the smoke exhaust efficiency, smoke exhaust opening distance and other aspects. Vauquelin [1] studies the factors that affect the efficiency of mechanical smoke exhaust. Rie Dong-Ho [2] ,Yuan Feng-Dong [3] use numerical simulation method to analyze and optimize the mechanical smoke exhaust effect of subway station under different ventilation modes.Yaqiang Jiang [4] puts forward that there is a transition zone and a complete absorption zone, and the efficiency of mechanical smoke exhaust decreases with the increase of the plugholing degree.…”

Air Movement Within Enclosed Road-Objects with Contra-Traffica CFD-Investigation

“…The air-fans, looking towards the eastern exit of the "Vranduk-2" -And while the high temperature-zones of the fire were visible in first sketches, on the iso-surface for the 10m/s, the displayed temperature-zone is fully enveloping the near-fire-place. The accidental thermal load (deep in the sketch) is carried away by the forced air-flow By performing this CFD-based study on covered traffic-objects of the given geometric characteristics within an existing road-infrastructure, the investigation on the accidental fire event was conducted according to the both planned scenarios of several experimental [33,42,44,45] and computer aided [46][47][48] research [49,50] research approaches. A "provocation" to conduct this research, was this specific geometry of the objects of interest, expecting new answers due to the possible impact of a reality-oriented traffic-enclosure (that was imbedded into a computational domain) onto this large-scale combustion and escorting occurrencesThe CFD-demonstration in this attempt, pointed that the geometric characteristic of explored tunnels was not "strong enough" to give major influence to the propagation of the combustion consequences in the first 120s of non-ventilated space -as well as in the case of 120s-long ventilation time of the mentioned caverns.…”

An engineering tool to calculate heat release rates of multiple objects in underground structures

“…Our experience of model tunnel fire tests in this scale shows there is a good agreement between model scale and full scale on many focused issues [11][12][13][14][15]. Such kind of scale is widely used in model tunnel fire tests all over the world [16][17][18][19]. The parameters that were varied during the experiments were: the number of wood cribs, type of wood cribs, the longitudinal ventilation rate and the ceiling height.…”