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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of air entrainment mode with natural ventilation using shafts in road tunnel fires
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Experimental study of air entrainment mode with natural ventilation using shafts in road tunnel fires

机译：巷道火灾中竖井自然通风引气模式的实验研究

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摘要

A set of burning experiments with n-heptane pool fire were conducted to investigate the air entrainment mode with natural ventilation using shafts in road tunnel fires. One criterion was proposed to determine the critical shaft height of the plug-holing occurrence in our previous work whereas this study quantifi-cationally analyzes the effect of plug-holing on the smoke exhaust efficiency. The disturbance of smoke exhausting on the smoke-air interface, which causes different amounts of fresh air exhausted directly and indirectly, is investigated. Results show that using vertical shafts to discharge smoke leads to a strong mixing process between the smoke layer and the fresh air. Consequently, about 2/3 of the smoke exhausting rate of the shaft is air. Moreover, some of the entrained air mixes into the smoke layer downstream the shaft, resulting, in a small reduction amount of the spilling smoke, which also proves an inefficient smoke exhausting process. Hence, for the sake of improving effectiveness of natural ventilation, some significant improvements are needed in practice.
机译：进行了一组正庚烷池火燃烧实验，以研究公路隧道火灾中使用竖井自然通风的引气方式。在我们以前的工作中，提出了一个确定塞孔发生的临界轴高度的标准，而本研究定量分析了塞孔对烟气排放效率的影响。研究了烟气界面上排烟的扰动，该扰动导致直接和间接排出不同数量的新鲜空气。结果表明，使用垂直轴排出烟气会导致烟气层与新鲜空气之间形成强烈的混合过程。因此，轴的排烟率的大约2/3是空气。此外，一些夹带的空气混入竖井下游的烟层中，导致少量溢出的烟气减少，这也证明烟气排放过程效率低下。因此，为了提高自然通风的效率，在实践中需要一些显着的改进。

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  • 作者

    C.G. Fan; J. Ji; Z.H. Gao; J.Y. Han; J.H. Sun;

  • 作者单位

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;

    State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    road tunnel; fire; natural ventilation; shaft; air entrainment;

    机译：公路隧道火;自然通风;轴空气夹带;

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