This paper experimentally studied the maximum temperature and ceiling temperature decays in a naturally ventilated tunnel designed with a transverse cross-passage. Influence of longitudinal fire location on the thermal temperature distribution was predominately investigated. A series of experimental tests were conducted in a 1/15 model tunnel with pool fires loaded into five different fuel pans. Meanwhile, smoke bifurcation and its thermal spreading inside tunnel was also observed and analyzed. Results indicated that values of the maximum temperature of the fire located at bifurcated point were relatively higher than the values of pool fires located at other locations. Meanwhile, ceiling temperature attenuation in the main tunnel was found to be insignificantly affected by the longitudinal fire location while temperature decays in the cross-passage was greatly affected. Based on experimental results, empirical models were proposed to calculate the maximum temperature in the main tunnel and to predict temperature decays in the cross-passage. Comparison among experimental data, predicted values, and literature values performed good agreement.

本文通过实验研究了设计有横向交叉通道的自然通风隧道中的最高温度和天花板温度衰减。主要研究纵向火灾位置对热温度分布的影响。在 1/15 模型隧道中进行了一系列实验测试，其中池火装入五个不同的燃料盘。同时，对烟气分叉及其在隧道内的热扩散进行了观察和分析。结果表明，分叉点火灾的最高温度值相对高于其他位置的水池火灾。同时，发现纵向火灾位置对主隧道顶棚温度衰减的影响不显着，而对交叉通道的温度衰减影响很大。根据实验结果，提出了经验模型来计算主隧道的最高温度和预测交叉通道的温度衰减。实验数据、预测值和文献值之间的比较表现出良好的一致性。