Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Study on the double effect of the tunnel slope on the fire induced smoke back-layering distance in naturally ventilated inclined tunnels
https://orcid.org/0000-0002-2600-0098
Highlights The tunnel slope has a double impact on the smoke back-layering distance (BLD). The smoke BLD is shown to be largely independent of the fire heat release rate in an inclined tunnel. A new dimensionless expression for smoke BLD is defined, considering the buoyancy resistant effect. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels.
Abstract This study focuses on the smoke back-layering distance (BLD), a crucial feature during a tunnel fire, in naturally ventilated inclined tunnels. It is explained, using a theoretical analysis as well as CFD simulations, that the tunnel slope has a double impact on the smoke BLD, through the fire-induced buoyancy: it naturally induces inlet airflow, but it also induces natural resistance against smoke downward flow. It is illustrated that, for a fire in a tunnel with inclination, this ‘buoyancy resistance’ results in a smoke BLD that is largely independent of the fire heat release rate. In horizontal or downward inclined tunnels, the natural buoyancy does not result in a limited smoke BLD. The effect of the inlet airflow can be characterized by a Froude number and the buoyancy resistance effect results in a newly defined dimensionless smoke BLD, based on the tunnel height, length and slope. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels, based on the CFD simulation results. It is validated by comparison to experimental data.
Study on the double effect of the tunnel slope on the fire induced smoke back-layering distance in naturally ventilated inclined tunnels
https://orcid.org/0000-0002-2600-0098
Highlights The tunnel slope has a double impact on the smoke back-layering distance (BLD). The smoke BLD is shown to be largely independent of the fire heat release rate in an inclined tunnel. A new dimensionless expression for smoke BLD is defined, considering the buoyancy resistant effect. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels.
Abstract This study focuses on the smoke back-layering distance (BLD), a crucial feature during a tunnel fire, in naturally ventilated inclined tunnels. It is explained, using a theoretical analysis as well as CFD simulations, that the tunnel slope has a double impact on the smoke BLD, through the fire-induced buoyancy: it naturally induces inlet airflow, but it also induces natural resistance against smoke downward flow. It is illustrated that, for a fire in a tunnel with inclination, this ‘buoyancy resistance’ results in a smoke BLD that is largely independent of the fire heat release rate. In horizontal or downward inclined tunnels, the natural buoyancy does not result in a limited smoke BLD. The effect of the inlet airflow can be characterized by a Froude number and the buoyancy resistance effect results in a newly defined dimensionless smoke BLD, based on the tunnel height, length and slope. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels, based on the CFD simulation results. It is validated by comparison to experimental data.
Study on the double effect of the tunnel slope on the fire induced smoke back-layering distance in naturally ventilated inclined tunnels
https://orcid.org/0000-0002-2600-0098
Highlights The tunnel slope has a double impact on the smoke back-layering distance (BLD). The smoke BLD is shown to be largely independent of the fire heat release rate in an inclined tunnel. A new dimensionless expression for smoke BLD is defined, considering the buoyancy resistant effect. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels.
Abstract This study focuses on the smoke back-layering distance (BLD), a crucial feature during a tunnel fire, in naturally ventilated inclined tunnels. It is explained, using a theoretical analysis as well as CFD simulations, that the tunnel slope has a double impact on the smoke BLD, through the fire-induced buoyancy: it naturally induces inlet airflow, but it also induces natural resistance against smoke downward flow. It is illustrated that, for a fire in a tunnel with inclination, this ‘buoyancy resistance’ results in a smoke BLD that is largely independent of the fire heat release rate. In horizontal or downward inclined tunnels, the natural buoyancy does not result in a limited smoke BLD. The effect of the inlet airflow can be characterized by a Froude number and the buoyancy resistance effect results in a newly defined dimensionless smoke BLD, based on the tunnel height, length and slope. A novel expression is proposed for the smoke BLD in inclined naturally ventilated tunnels, based on the CFD simulation results. It is validated by comparison to experimental data.
Study on the double effect of the tunnel slope on the fire induced smoke back-layering distance in naturally ventilated inclined tunnels
Sun, Jiayun (Autor:in) / Wang, Junheng (Autor:in) / Fang, Zheng (Autor:in) / Tang, Zhi (Autor:in) / Merci, Bart (Autor:in)
21.10.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Fire and smoke control in naturally ventilated buildings
| Online Contents | 2006
Fire and smoke control in naturally ventilated buildings
| British Library Online Contents | 2006