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首页> 外文期刊>Combustion and Flame >Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation
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Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation

机译：自然通风条件下沿模型隧道纵向中心线两次池火引发火焰合并行为的实验研究

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摘要

A set of experiments was conducted in a model tunnel to study the interaction behaviors of two pool fires. Square heptane pool fires with side lengths of 10 an, 13 cm and 16 cm were used as the fire sources. In the experiments, two identical fires were located at the longitudinal centerline of tunnel. The fire spacing was set as an integral multiple of the half pool length. The mass loss rates of two fires in tunnel were compared with funs in the open space and it was explained from the viewpoints of the interactive burnings and the heat feedback mechanism. Results showed that as the spacing decreases, the mass loss rate increases first and then decreases. Similar trends can be found in heat fluxes received by objects at the pool surface level. With decreasing the spacing, the longitudinal ceiling flame shapes are divided into four categories, i.e., non-interaction flames, tilted flames without merging, merging ceiling flames and merging vertical flames. The image processing method is used to judge the flame merging and to obtain the position of merging point and the flame length. An expression correlating the distance from the merging point to the ceiling and the normalized spacing is established. By using dimensional analysis and introducing a correlation factor, a correlation for predicting the effective ceiling flame length is developed, involving the heat release rate, pool size, spacing and effective tunnel height. Moreover, a method to estimate the flame radiant fluxes received by the objects located in the lower layer of tunnel with vertical and horizontal orientations is proposed to further reveal the mechanism of heat radiation from two interacting fires in tunnel. (C) 2016 The Combustion Institute. Published by Elsevier Inc All rights reserved.
机译：在模型隧道中进行了一组实验，以研究两种水池火灾的相互作用。边长为10 an，13 cm和16 cm的正方形庚烷池火被用作火源。在实验中，两个相同的火灾位于隧道的纵向中心线。火间隔设置为半池长度的整数倍。将隧道内两次火灾的质量损失率与开放空间的乐趣进行了比较，并从交互燃烧和热反馈机制的角度进行了解释。结果表明，随着间距的减小，质量损失率先增大然后减小。在池表面水平处物体接收的热通量中可以发现类似的趋势。随着间距的减小，纵向天花板火焰的形状被分为四类，即非相互作用火焰，不合并的倾斜火焰，合并天花板火焰和垂直火焰。该图像处理方法用于判断火焰融合并获得融合点的位置和火焰长度。建立使从合并点到天花板的距离与标准化间距相关的表达式。通过使用尺寸分析并引入相关因子，建立了用于预测有效天花板火焰长度的相关性，其中涉及放热率，池尺寸，间距和有效隧道高度。此外，提出了一种估算位于隧道下部垂直和水平方向的物体接收的火焰辐射通量的方法，以进一步揭示隧道中两种相互作用的火产生的热辐射机理。 （C）2016年燃烧研究所。由Elsevier Inc.保留所有权利。

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  • 来源
    《Combustion and Flame》 |2016年第11期|307-318|共12页
  • 作者

    Ji Jie; Wan Huaxian; Gao Zihe; Fu Yanyun; Sun Jinhua; Zhang Yongming; Li Kaiyuan; Hostikka Simo;

  • 作者单位

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China|Univ Sci & Technol China, Inst Adv Technol, Hefei 230088, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China;

    Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China;

    Aalto Univ, Sch Engn, Dept Civil Engn, Espoo 02150, Finland;

    Aalto Univ, Sch Engn, Dept Civil Engn, Espoo 02150, Finland;

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

    Tunnel fire; Multiple pool fires; Mass loss rate; Flame length; Heat flux;

    机译：隧道火灾;多水池火灾;质量损失率;火焰长度;热通量;

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