Rights statement: This is the author’s version of a work that was accepted for publication in Tunnelling and Underground Space Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Tunnelling and Underground Space Technology, 80, 2018 DOI: 10.1016/j.tust.2018.05.022
Accepted author manuscript, 849 KB, PDF document
Available under license: CC BY-NC-ND
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - A model for predicting smoke back-layering length in tunnel fires with the combination of longitudinal ventilation and point extraction ventilation in the roof
AU - Wang, Junheng
AU - Yuan, Jianping
AU - Fang, Zheng
AU - Tang, Zhi
AU - Qian, Peng
AU - Ye, Jianqiao
N1 - This is the author’s version of a work that was accepted for publication in Tunnelling and Underground Space Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Tunnelling and Underground Space Technology, 80, 2018 DOI: 10.1016/j.tust.2018.05.022
PY - 2018/10/1
Y1 - 2018/10/1
N2 - 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.
AB - 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.
KW - Back-layering length
KW - Longitudinal ventilation
KW - Point extraction
KW - Tunnel fire
U2 - 10.1016/j.tust.2018.05.022
DO - 10.1016/j.tust.2018.05.022
M3 - Journal article
AN - SCOPUS:85048179801
VL - 80
SP - 16
EP - 25
JO - Tunnelling and Underground Space Technology
JF - Tunnelling and Underground Space Technology
SN - 0886-7798
ER -