铁路隧道横通道临界风速研究

发布时间：2018-02-01 21:28

本文关键词： 横通道临界风速纵向风速火源释放率隧道火灾铁路隧道　出处：《中国铁道科学》2017年04期 　论文类型：期刊论文

【摘要】：铁路隧道横通道临界风速是横通道能否有效防烟的重要参数。根据π定理和相似理论,对影响横通道临界风速的相关因素进行量纲分析,推导出横通道临界风速与隧道纵向风速、火灾热释放率、横通道防火门的高度及宽度、横通道与隧道的夹角这5个影响参数的无量纲函数关系式;通过数值模拟并对模拟数据拟合,确定横通道临界风速与这5个影响参数的关系。结果表明:当无量纲隧道纵向风速不大于0.114时,横通道临界风速随隧道纵向风速的增大呈3/7次方的增长关系,当隧道纵向风速大于0.114时,横通道临界风速随隧道纵向风速的增大呈-3/40次方的减小关系;横通道临界风速与火源热释放率呈1/3次方的增长关系、与防火门高度近似呈6/5次方的增长关系、与防火门的门宽无关、与横通道和隧道之间的夹角呈-3/8次方的减小关系。根据这些拟合结果确定无量纲函数关系式中各未知系数的取值,进而得到横通道临界风速的无量纲计算公式。
[Abstract]:The critical wind speed is an important parameter for effective smoke prevention in railway tunnel. According to the 蟺 theorem and similarity theory, the dimension analysis of the factors affecting the critical wind speed is carried out. The dimensionless relations of critical wind speed and tunnel longitudinal wind speed, fire heat release rate, height and width of fire protection door and angle between transverse passage and tunnel are derived. Through numerical simulation and simulation data fitting, the relationship between the critical wind speed and the five influence parameters is determined. The results show that when the longitudinal wind speed of the dimensionless tunnel is less than 0.114. The critical wind speed of the tunnel increases to the power of 3/7 with the increase of the longitudinal wind speed of the tunnel, when the longitudinal wind speed of the tunnel is greater than 0.114. The critical wind velocity of the transverse tunnel decreases to the power of -3 / 40 with the increase of the longitudinal wind speed of the tunnel. The critical wind speed of the transverse passage increases to the 1/3 power with the heat release rate of the fire source, and the height of the fire proof door increases to the 6/5 power, and it has nothing to do with the door width of the fire prevention door. The angle between the cross passage and the tunnel is reduced by -3 / 8. According to these fitting results, the values of unknown coefficients in the dimensionless function relationship are determined. Then the dimensionless formula for calculating critical wind velocity of transverse passage is obtained.
【作者单位】：武汉科技大学资源与环境工程学院;武汉科技大学消防安全技术研究所;
【基金】：湖北省自然科学基金资助项目(2015CFB200) 湖北省教育厅科学研究计划重点项目(D20151104,D20161105) 公安部消防局科研计划项目(2016XFCX20)
【分类号】：U458
【正文快照】： 横通道是指2条单线铁路隧道之间设置的互为连通、用来疏散旅客的通道。当铁路隧道发生火灾时,人员经横通道疏散至非事故隧道避难[1]。为保证疏散安全,需对横通道进行送风防烟,其中恰好能抑制烟气侵入横通道的风速称为横通道的临界风速[2]。部分学者对隧道横通道临界风速进行了

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