列车着火后继续在隧道中行驶的烟气特性

发布时间：2018-01-01 09:00

  本文关键词：列车着火后继续在隧道中行驶的烟气特性　出处：《华南理工大学学报(自然科学版)》2016年06期 　论文类型：期刊论文

  更多相关文章： 地铁隧道 列车火灾 烟气特性 数值模拟 热释放速率 温度

【摘要】：保障隧道列车着火后继续向前行驶的安全性是火灾应急救援的目标.文中采用计算流体动力学方法,使用STAR-CCM+软件的滑移网格功能,研究了不同列车行驶速度和火源热释放速率对隧道内烟气特性的影响,得到列车携带火源在隧道内行驶时烟气温度的分布规律和最佳行驶速度.结果表明:隧道列车着火后继续向前行驶时,存在一个使温度达到最低的最佳行驶速度50km/h;当列车运行速度恒定时,火灾热释放速率越大,人眼高度处的最高温度也越高;热释放速率恒定时,最高温度随着列车行驶速度的增大先减小后增大,呈开口向上的抛物线形状;随着着火列车向前运行,列车车顶进风口的最高温度逐渐上升,在隧道横断面的中性面上,最高温度值有较大的振荡;在隧道内340 m处温度最低,但是也达到了166.45℃.列车顶部区域的温度过高,可能会被烧毁性破坏,因此可考虑在列车着火后继续向前运动的同时给隧道通风,以降低环形空间的温度.
[Abstract]:The aim of fire emergency rescue is to ensure the safety of tunnel train moving forward after fire. In this paper, the method of computational fluid dynamics (CFD) and the sliding grid function of STAR-CCM software are used. The influence of different train speed and heat release rate of fire source on flue gas characteristics in tunnel is studied. The distribution of flue gas temperature and the optimum driving speed are obtained when the train carries the fire source in the tunnel. The results show that the tunnel train continues to move forward after the fire. There is an optimum speed of 50 km / h for the lowest temperature; When the train speed is constant, the higher the fire heat release rate, the higher the maximum temperature at the eye height. When the heat release rate is constant, the maximum temperature decreases first and then increases with the increase of train speed, and then increases in the shape of parabola with the opening up. With the fire train running forward, the maximum temperature of the roof inlet of the train rises gradually, and the maximum temperature oscillates greatly on the neutral surface of the tunnel cross section. The temperature is the lowest at 340 m in the tunnel, but it also reaches 166.45 鈩，

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