A model for predicting smoke back-layering length in tunnel fires with the combination of longitudinal ventilation and point extraction ventilation in the roof

Content Provider	Semantic Scholar
Author	Wang, Junheng Yuan, Jianping Fang, Zheng Tang, Zhi Qian, Peng Ye, Jianqiao
Copyright Year	2018
Abstract	Abstract An analytical model is developed for quantifying the fire smoke back-layering length in a tunnel with a combination of longitudinal ventilation and point extraction ventilation in the roof. The distance of smoke vent to fire source is incorporated as well as mass flow rate during the whole smoke flow process according to the mass conservation principle. The model input quantities are the heat release rate of the fire source, the longitudinal velocity, the exhaust velocity, the width and the height of the tunnel, the distance of the smoke vent to the fire source and the area of the smoke vent. The quality of the model predictions is illustrated for a range of experimental conditions. After that, extensive model predictions on the back-layering length are presented to show its trends by varying the velocity of the longitudinal ventilation, the exhaust velocity and the position of the smoke vent in the roof. Discussions are given at last. It is highlighted that shortening the distance between the smoke vent and the fire source benefits shortening the back-layering length, and this phenomenon is more pronounced for higher exhaust velocity.
Starting Page	16
Ending Page	25
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1016/j.tust.2018.05.022
Volume Number	80
Alternate Webpage(s)	https://eprints.lancs.ac.uk/id/eprint/125959/1/A_model_for_predicting_smoke_back_layering_length_in_tunnel_fires_with_the_combination_of_longitudinal_ventiltion_and_point_extraction_ventilation_in_the_roof_revised_.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.tust.2018.05.022
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article