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Numerical Analysis of Highway Tunnel Fire under Semi-Transverse and Transverse Ventilation Systems
Numerical analysis of highway tunnel fire under semi-transverse and transverse ventilation system with the CFD code FLUENT are presented. In particular, the effect of ventilating velocity is investigated. Results show that in the tunnel with semi-transverse ventilation, when there is no wind (v=0m/s) in ventilating duct, the diffusion distance of fire is limited in the both side of the fire point about 35 m range, and the diffusion distance of high-temperature smoke in tunnel space decreases with the increase of ventilating velocity, while excessive ventilating velocity will lower the exhaust efficiency of ventilating duct. The critical ventilating velocity for semi-transverse ventilation system is 5 m/s in the case of the 5 MW heat release rate. In the tunnel with transverse ventilation, the diffusion distance of high-temperature smoke increases with the decrease of ventilating velocity in supply air vent. When the ventilating velocity in supply air vent is big, the smoke would spread to the both sides of the ventilating duct which is bad for exhausting the smoke. The critical ventilating velocity for transverse ventilation system is 3 m/s in the case of the 5 MW heat release rate.
Numerical Analysis of Highway Tunnel Fire under Semi-Transverse and Transverse Ventilation Systems
Numerical analysis of highway tunnel fire under semi-transverse and transverse ventilation system with the CFD code FLUENT are presented. In particular, the effect of ventilating velocity is investigated. Results show that in the tunnel with semi-transverse ventilation, when there is no wind (v=0m/s) in ventilating duct, the diffusion distance of fire is limited in the both side of the fire point about 35 m range, and the diffusion distance of high-temperature smoke in tunnel space decreases with the increase of ventilating velocity, while excessive ventilating velocity will lower the exhaust efficiency of ventilating duct. The critical ventilating velocity for semi-transverse ventilation system is 5 m/s in the case of the 5 MW heat release rate. In the tunnel with transverse ventilation, the diffusion distance of high-temperature smoke increases with the decrease of ventilating velocity in supply air vent. When the ventilating velocity in supply air vent is big, the smoke would spread to the both sides of the ventilating duct which is bad for exhausting the smoke. The critical ventilating velocity for transverse ventilation system is 3 m/s in the case of the 5 MW heat release rate.
Numerical Analysis of Highway Tunnel Fire under Semi-Transverse and Transverse Ventilation Systems
Xue, Bin (author) / Pei, Jianzhong (author) / Zhang, Jiupeng (author) / Li, Yanwei (author) / Li, Rui (author) / Zhou, Linghao (author)
Transportation Research Congress 2016 ; 2016 ; Beijing, China
Transportation Research Congress 2016 ; 604-613
2018-02-06
Conference paper
Electronic Resource
English
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