Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental Study on Maximum Ceiling Temperature in Traffic Merging Section Tunnel Fires
In recent years, the construction of branched tunnels has increased in cities to facilitate the interconnection of urban transportation systems. However, these bifurcated sections create a complex traffic flow state, thus posing a higher fire risk. Moreover, the rapidly changing boundaries at the tunnel traffic merging section will cause a complex fire and smoke transportation behavior once a fire occurs. Previous studies have observed the lateral deflection of flames towards the sidewall under natural ventilation conditions, whereas the effect of ventilation conditions and associated temperature distribution characteristics are still unknown. In this study, the effect of inflow conditions and heat release rate (HRR) on flame behavior and temperature distribution in the tunnel traffic merging section was studied with a set of reduce-scale model experiments. Results indicate that the temperature distribution at the traffic merging section shows a strong multidimensional feature due to the coupling effect of rapidly changing boundaries and the fire buoyant-induced flow. As a result of multidimensional flame deflection, the location of the maximum temperature on the ceiling deviates from the center axis. Finally, a prediction equation to evaluate the maximum ceiling temperature is proposed by introducing confluence velocity to modify the classical plume theory. This work contributes to a more comprehensive understanding of the fire dynamic theory in bifurcated tunnels and can inform the development of effective fire safety measures.
Experimental Study on Maximum Ceiling Temperature in Traffic Merging Section Tunnel Fires
In recent years, the construction of branched tunnels has increased in cities to facilitate the interconnection of urban transportation systems. However, these bifurcated sections create a complex traffic flow state, thus posing a higher fire risk. Moreover, the rapidly changing boundaries at the tunnel traffic merging section will cause a complex fire and smoke transportation behavior once a fire occurs. Previous studies have observed the lateral deflection of flames towards the sidewall under natural ventilation conditions, whereas the effect of ventilation conditions and associated temperature distribution characteristics are still unknown. In this study, the effect of inflow conditions and heat release rate (HRR) on flame behavior and temperature distribution in the tunnel traffic merging section was studied with a set of reduce-scale model experiments. Results indicate that the temperature distribution at the traffic merging section shows a strong multidimensional feature due to the coupling effect of rapidly changing boundaries and the fire buoyant-induced flow. As a result of multidimensional flame deflection, the location of the maximum temperature on the ceiling deviates from the center axis. Finally, a prediction equation to evaluate the maximum ceiling temperature is proposed by introducing confluence velocity to modify the classical plume theory. This work contributes to a more comprehensive understanding of the fire dynamic theory in bifurcated tunnels and can inform the development of effective fire safety measures.
Experimental Study on Maximum Ceiling Temperature in Traffic Merging Section Tunnel Fires
Lecture Notes in Civil Engineering
Wu, Wei (Herausgeber:in) / Leung, Chun Fai (Herausgeber:in) / Zhou, Yingxin (Herausgeber:in) / Li, Xiaozhao (Herausgeber:in) / Li, Jiangdong (Autor:in) / Chen, Xiaofeng (Autor:in) / Luo, Chunhou (Autor:in) / Zhang, Tianhang (Autor:in) / Wu, Ke (Autor:in)
Conference of the Associated research Centers for the Urban Underground Space ; 2023 ; Boulevard, Singapore
10.07.2024
6 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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