• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Tunnelling and underground space technology >Re-direction of smoke flow in inclined tunnel fires
【24h】

Re-direction of smoke flow in inclined tunnel fires

机译：倾斜隧道火灾中烟流的重定向

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The re-direction of smoke flow in inclined tunnel fires refers to the phenomenon that the smoke flow direction suddenly changes due to the changes of thermal buoyancy or outside pressure or the activation of fans. This poses special risk for fire rescue services fighting fires in tunnels. Both small-scale tunnel fire tests (28 scenarios) and numerical simulations of full-scale tunnel fires (31 scenarios) were conducted to study this special phenomenon. A one-dimensional model was used to predict the flow velocity in the inclined tunnels, based on two different methods for calculating the mean smoke temperature (Method I and Method II, respectively). Results show that the smoke flow direction could be well predicted by the model with Method II. When the ventilation velocity is relatively large and the flow tends to be one dimensional, both methods produce similar results. Further, the influences of important factors on the re-direction of smoke flows were systematically analyzed. These factors include heat release rate, tunnel slope, tunnel length, friction factor, tunnel cross sectional area and fire source location.
机译：倾斜隧道火灾中烟流的重新定向是指由于热浮力或外部压力的变化或风扇的激活而使烟流的方向突然改变的现象。这给在隧道中扑救火灾的消防服务带来了特殊的风险。为了研究这种特殊现象，进行了小型隧道火灾测试（28个场景）和全尺寸隧道火灾的数值模拟（31个场景）。基于计算平均烟气温度的两种不同方法（分别为方法I和方法II），使用一维模型来预测倾斜隧道中的流速。结果表明，用方法Ⅱ模型可以很好地预测烟气的流向。当通风速度较大且流量趋于一维时，两种方法均会产生相似的结果。此外，系统地分析了重要因素对烟流改向的影响。这些因素包括放热率，隧道坡度，隧道长度，摩擦系数，隧道横截面积和火源位置。

著录项

  • 来源
    《Tunnelling and underground space technology》 |2019年第4期|113-127|共15页
  • 作者

    Zhao Shengzhong; Li Ying Zhen; Kumm Mia; Ingason Haukur; Liu Fang;

  • 作者单位

    RISE Res Inst Sweden, Safety & Transport Fire Res, Boras, Sweden|Chongqing Univ, Fac Urban Construct & Environm Engn, Chongqing, Peoples R China;

    RISE Res Inst Sweden, Safety & Transport Fire Res, Boras, Sweden;

    RISE Res Inst Sweden, Safety & Transport Fire Res, Boras, Sweden;

    RISE Res Inst Sweden, Safety & Transport Fire Res, Boras, Sweden;

    Chongqing Univ, Fac Urban Construct & Environm Engn, Chongqing, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Re-direction; Slope; Tunnel fires; Smoke movement;

    机译：重定向;坡度;隧道火灾;烟气运动;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号