地下工程走廊宽高比对烟气层温度衰减系数影响研究

Study on the Influence of Corridor Aspect Ratio on Attenuation Coefficient of Smoke Layer Temperature in Underground Engineering

为讨论走廊的高宽比对地下工程火灾时走廊烟气层温度衰减系数的影响,根据相似原理搭建了地下工程典型单室—走廊结构模型实验台,进行了不同走廊尺寸和火源规模条件下的10个工况实验,并将模型实验结果、前人和笔者得到的理论模型预测结果进行了对比分析。结果表明,地下工程走廊烟气层温度的衰减系数随着走廊高宽比的减小而增大,烟气与围护结构之间的换热相对增强,衰减系数随火源规模的变大呈衰减趋势,火源规模越大走廊中烟气层温度衰减越小。

In order to discuss the influence of corridor aspect ratio on attenuation coefficient of smoke layer temperature in Underground engineering,according to the similarity principle,a Underground engineering typical room-corridor structure model test-bench was built.Experiments were carried out under 10 working conditions with different corridor sizes and fire source sizes,the model experimental results and the theoretical model prediction results obtained by predecessors and the author are compared and analyzed.The results show that the attenuation coefficient of smoke layer temperature increases with the decrease of corridor aspect ratio,the heat transfer between the smoke and the enclosure is enhanced,the attenuation coefficient decreases with the increase of fire source,the larger the fire source,the smaller the attenuation coefficient of smoke layer temperature in the corridor.