Influence of train on control of smoke flow in small-scale tunnel fire experiment

被引：0
|
作者：
Li Y.-Z. [1 ]
Lei B. [1 ]
机构：
[1] School of Mechanical Engineering, Southwest Jiaotong University
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2010年 / 32卷 / 05期
关键词：
Backlayering length; Critical velocity; Froude number; Model train; Tunnel fire;
D O I：
10.3969/j.issn.1001-8360.2010.05.025
中图分类号：
学科分类号：
摘要：
Small-scale fire experiments were carried out in the reduced-scale model of the Taihangshan Railway Tunnel under the conditions with and without a model train inside the model tunnel. The critical Froude numbers for preventing smoke backflow in the two different operating conditions are compared with each other. Factors influencing the smoke backlayering lengths are analyzed. The results show that the critical velocity decreases as large as 23% while a model train occupies around 20% of the tunnel cross-section. The decrease rate is slightly larger than the train-tunnel dimension ratio and almost independent of the heat release rate. The critical Froude number is relative to the heat release rate, it is not a constant, but can be divided into two categories, the constant region and linearity region. The dimensionless backlayering length and the Froude number approximate to linear in mutual relations. The smoke backlayering length is significantly larger without model trains when the Froude number remains the same.
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页码：136 / 139
页数：3
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