• 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 >Large Eddy Simulation of effectiveness of solid screen on improving natural ventilation performance in urban tunnels
【24h】

Large Eddy Simulation of effectiveness of solid screen on improving natural ventilation performance in urban tunnels

机译：大涡模拟对固体筛网改善城市隧道自然通风性能的有效性

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

To improve natural ventilation performance in urban tunnels, a method of adding solid screens below shafts, was proposed to accumulate fire-induced smoke and weaken negative influence of plug-holing. A series of simulations were carried out to analyze the reliability of this method based on Large Eddy Simulation. Thermal and spreading characteristics of smoke were studied in detail, with systematically varying the angle of solid screen and the longitudinal wind speed in the tunnel. Results show that without wind in the tunnel, all smoke is blocked from spreading downstream after adding the solid screen, thus the smoke layer thickness downstream of the fire increases, and the plug-holing is prevented. The stack effect is enhanced due to the thicker and higher-temperature smoke layer. With wind in the tunnel, the smoke spreads across the solid screen and continues spreading downstream, but the solid screen with different angles can still increase the effective mass flow rate of exhausted smoke greatly. The solid screen with an acute angle performs better than that with an obtuse angle in exhausting smoke. Meanwhile, the practical engineering application of solid screens in tunnels with natural ventilation was demonstrated in detail.
机译：为了改善城市隧道的自然通风性能，提出了一种在竖井下方增加实心屏风的方法，以累积起火引起的烟雾并减弱堵塞孔的负面影响。在大涡模拟的基础上，进行了一系列的仿真，分析了该方法的可靠性。详细研究了烟雾的热和扩散特性，系统地改变了固体滤网的角度和隧道内的纵向风速。结果表明，在隧道内无风的情况下，加入实心滤网后，所有烟雾均无法向下游扩散，从而增加了火灾下游的烟层厚度，并防止了堵塞。烟层更厚，温度更高，因此烟囱效应得到增强。随着风在隧道中的传播，烟尘会散布在固体滤网上并继续向下游扩散，但是不同角度的固体滤网仍然可以大大提高排烟的有效质量流量。在排出烟雾时，具有锐角的实心屏幕要比具有钝角的实心屏幕好。同时，详细介绍了固体筛网在自然通风隧道中的实际工程应用。

著录项

  • 来源
    《Tunnelling and underground space technology》 |2019年第4期|174-185|共12页
  • 作者

    Zhou Yang; Yang Yang; Jiao Shucheng; Zhang Li; Fan Chuangang; Ding Chao; Liu Xiaoping;

  • 作者单位

    Cent S Univ, Sch Civil Engn, Changsha, Hunan, Peoples R China;

    Cent S Univ, Sch Civil Engn, Changsha, Hunan, Peoples R China;

    Hefei Univ Technol, Sch Automot & Transportat Engn, Hefei, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Automot & Transportat Engn, Hefei, Anhui, Peoples R China;

    Cent S Univ, Sch Civil Engn, Changsha, Hunan, Peoples R China|Hefei Univ Technol, Sch Automot & Transportat Engn, Hefei, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, Hefei, Anhui, Peoples R China;

    Hefei Univ Technol, Sch Civil Engn, Hefei, Anhui, Peoples R China;

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

    Natural ventilation; Shaft; Urban tunnel; Solid screen; Large Eddy Simulation;

    机译：自然通风竖井城市隧道固体滤网大涡模拟;

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