Effect of blockage ratio on backlayering length of thermal smoke flow in a longitudinally ventilated tunnel

被引：31

作者：

Meng, Na ^{[1
,2
]}

Liu, Xiaomei ^{[3
]}

Li, Xiao ^{[1
]}

Liu, Beibei ^{[1
]}

机构：

[1] Shandong Univ Sci & Technol, Coll Min & Safety Engn, Qingdao 266590, Shandong, Peoples R China

[2] Shandong Univ Sci & Technol, Natl Demonstrat Ctr Expt Min Engn Educ, Qingdao 266590, Shandong, Peoples R China

[3] Shandong Univ Sci & Technol, Coll Mat Sci & Engn, Qingdao 266590, Shandong, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2018年 / 132卷

基金：

中国国家自然科学基金;

关键词：

Tunnel fire; Longitudinal ventilation; Backlayering length; blockage ratio; BACK-LAYERING LENGTH; CRITICAL VELOCITY; POINT EXTRACTION; SUBWAY STATION; ROAD TUNNEL; METRO TRAIN; FIRE; PREDICTION; THICKNESS; PLATFORM;

D O I：

10.1016/j.applthermaleng.2017.12.064

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Experiments were conducted in a reduced-scale tunnel to investigate the effect of blockage ratio on back layering length in a longitudinally ventilated tunnel. Model vehicle blockages are placed upstream of the fire source and blockage ratios are ranged in 0.13-0.51. It is found that when there is no blockage in the tunnel, experimental data can be well correlated by Li model. However, when there is blockage upstream of the fire source, the backlayering length is shown to be lower than the predictions of Li model. Tang model fails to collapse the experimental data in the present work due to the difference in blockage ratio. A new expression by considering the factor blockage ratio is proposed to predict the backlayering length of smoke flow, which is shown to well collapse the experimental measurements. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：1 / 7

页数：7

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