Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experiment on Effects of Sealing Rate on Fire Behaviors in Sealing Tactics Against Tunnel Fire
In the process of sealing tactics against tunnel fire (STATF), sealing rate defined as sealing ratio per unit time, impacts upon sealing firefighting effect via influencing the air flowing, smoke exhaust, etc. A 1/9 small-scale tunnel model was established to study the effects of sealing rate on tunnel fires in this paper. Taken fire size and sealing rate into account, the mass loss rate (MLR), temperature characteristics, and fire overflow were compared and studied. The results show that the MLR starts to drop earlier with the increase of sealing rate. Furthermore, a new parameter, sealing efficiency (denoted by λ), is introduced related to the moment of ceiling temperature in tunnel center turning to drop and the initial sealing time. It is found that the sealing efficiency is improved with the increase of sealing rate. Notably, sealing efficiency minimizes to minus when sealing rate reaches its minimum, indicating that it would have a negative feedback effect on fire extinguishment when sealing rate reduces to a certain degree. In addition, with the decrease of sealing rate, the maximum radiation heat near the tunnel entrance is higher and the existence duration of high-temperature smoke gets longer, which might pose a greater threat to firefighters.
Experiment on Effects of Sealing Rate on Fire Behaviors in Sealing Tactics Against Tunnel Fire
In the process of sealing tactics against tunnel fire (STATF), sealing rate defined as sealing ratio per unit time, impacts upon sealing firefighting effect via influencing the air flowing, smoke exhaust, etc. A 1/9 small-scale tunnel model was established to study the effects of sealing rate on tunnel fires in this paper. Taken fire size and sealing rate into account, the mass loss rate (MLR), temperature characteristics, and fire overflow were compared and studied. The results show that the MLR starts to drop earlier with the increase of sealing rate. Furthermore, a new parameter, sealing efficiency (denoted by λ), is introduced related to the moment of ceiling temperature in tunnel center turning to drop and the initial sealing time. It is found that the sealing efficiency is improved with the increase of sealing rate. Notably, sealing efficiency minimizes to minus when sealing rate reaches its minimum, indicating that it would have a negative feedback effect on fire extinguishment when sealing rate reduces to a certain degree. In addition, with the decrease of sealing rate, the maximum radiation heat near the tunnel entrance is higher and the existence duration of high-temperature smoke gets longer, which might pose a greater threat to firefighters.
Experiment on Effects of Sealing Rate on Fire Behaviors in Sealing Tactics Against Tunnel Fire
Wu, Guan-Yuan (Herausgeber:in) / Tsai, Kuang-Chung (Herausgeber:in) / Chow, W. K. (Herausgeber:in) / Chen, Changkun (Autor:in) / Xiao, Huang (Autor:in) / Chen, Jie (Autor:in) / Zhao, Xiaolong (Autor:in) / Zhu, Congxiang (Autor:in)
Asia-Oceania Symposium on Fire Science and Technology ; 2018 ; Taipei, Taiwan
The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology ; Kapitel: 70 ; 955-970
01.01.2020
16 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
| Engineering Index Backfile | 1923