Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
AbstractIn order to study the effect of varied blockage-fire source distances (rectangular cylinder shape) on the smoke layer thickness in a longitudinal ventilated tunnel, a series of experiments were conducted in a 1/6 model tunnel platform. Varied longitudinal ventilation velocities, fire heat release rates, and blockage-fire distances D were considered. The vertical region temperature was measured by using a thermocouple tree, and the integral ratio method was used to calculate the smoke layer thickness. It was determined that the smoke temperature at any specified height decreased with increasing longitudinal ventilation velocity. The smoke layer thickness increased with increasing longitudinal ventilation velocity irrespective of the presence or absence of vehicular blockage, and the smoke layer thickness in the presence of vehicular blockages was smaller than that in the absence of blockages.
HighlightsSmoke flow experiments were carried out in a 66 m long scale model tunnel.Vertical temperature under tunnel ceiling with blockage effect was considered.Smoke layer thickness increases with increasing longitudinal ventilation velocity.The factor of various blockage–fire source distance including 0 m is considered.The smoke layer thickness is smaller than that in the absence of blockages.
AbstractIn order to study the effect of varied blockage-fire source distances (rectangular cylinder shape) on the smoke layer thickness in a longitudinal ventilated tunnel, a series of experiments were conducted in a 1/6 model tunnel platform. Varied longitudinal ventilation velocities, fire heat release rates, and blockage-fire distances D were considered. The vertical region temperature was measured by using a thermocouple tree, and the integral ratio method was used to calculate the smoke layer thickness. It was determined that the smoke temperature at any specified height decreased with increasing longitudinal ventilation velocity. The smoke layer thickness increased with increasing longitudinal ventilation velocity irrespective of the presence or absence of vehicular blockage, and the smoke layer thickness in the presence of vehicular blockages was smaller than that in the absence of blockages.
HighlightsSmoke flow experiments were carried out in a 66 m long scale model tunnel.Vertical temperature under tunnel ceiling with blockage effect was considered.Smoke layer thickness increases with increasing longitudinal ventilation velocity.The factor of various blockage–fire source distance including 0 m is considered.The smoke layer thickness is smaller than that in the absence of blockages.
Experimental study on thermal smoke layer thickness with various upstream blockage–fire distances in a longitudinal ventilated tunnel
Journal of Wind Engineering and Industrial Aerodynamics ; 170 ; 141-148
05.08.2017
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2018