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首页> 外文期刊>Tunnelling and underground space technology >Experimental study on flame characteristics of double fires in a naturally ventilated tunnel: Flame merging, flame tilt angle and flame height
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Experimental study on flame characteristics of double fires in a naturally ventilated tunnel: Flame merging, flame tilt angle and flame height

机译：天然通风隧道双射线火焰特性的实验研究：火焰合并，火焰倾斜角度和火焰高度

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摘要

A series of fire tests was carried out to investigate the diffusion flame characteristics of double fires generated from separated burners in a naturally ventilated tunnel, considering different heat release rates and fire separation distances. The results show that the flame tilt angle, as well as the horizontal projected flame length, first increases with fire separation distance and then remains constant, but the vertical flame length first decreases and then remains constant, which is different from two fires in free spaces where flames do not tilt when the separation distance is relatively long. This difference is caused by the non-dimensional fire induced air flow velocity in the tunnel, which is mainly related to the tunnel cross-section dimensions and burner radius. Three regions can be identified, i.e. flame vertical merging, plume vertical merging and non-merging with flame tilted. The critical flame merging separation distance, estimated by the flame merging probability, is greater than that of two fires in an open environment due to the fire-induced air flows. The merging flame height is lower than that of a single fire with a same heat release rate. A correlation was proposed to estimate flame height of two fires in a tunnel by the modified non-dimensional heat release rate using an air entrainment perimeter as the characteristic length. This work enhances the understanding of diffusion flame behaviors of double fires in naturally ventilated tunnels.
机译：考虑到不同的热释放速率和火灾分离距离，进行了一系列火试验，以研究从分离的燃烧器中由分离的燃烧器产生的双火的分散火焰特性。结果表明，火焰倾斜角度，以及水平投影火焰长度，首先用火分离距离增加，然后保持恒定，但垂直火焰长度首先减小，然后保持恒定，从自由空间中的两个火焰不同当分离距离相对较长时，火焰不会倾斜。这种差异是由隧道中的非维性火灾引起的空气流速引起的，这主要与隧道横截面尺寸和燃烧器半径有关。可以识别三个区域，即火焰垂直合并，羽流垂直合并和与火焰倾斜的非合并。由火焰合并概率估计的临界火焰合并分离距离大于由于火灾引起的空气流量的开放环境中的两个火灾中的分离距离。合并火焰高度低于具有相同热释放速率的单火的熔体高度。提出了通过使用空气夹带周长作为特征长度的改进的非尺寸热释放速率来估计隧道中两次火焰的火焰高度的相关性。这项工作提高了对天然通风隧道中双射下的扩散火焰行为的理解。

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  • 来源
    《Tunnelling and underground space technology》 |2021年第8期|103912.1-103912.10|共10页
  • 作者

    He Kun; Cheng Xudong; Li Ying Zhen; Ingason Haukur; Shi Zhicheng; Yang Hui; Zhang Heping;

  • 作者单位

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China|RISE Res Inst Sweden Fire Res Safety & Transport Stockholm Sweden;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    RISE Res Inst Sweden Fire Res Safety & Transport Stockholm Sweden;

    RISE Res Inst Sweden Fire Res Safety & Transport Stockholm Sweden;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

    Univ Sci & Technol China State Key Lab Fire Sci Hefei 230026 Anhui Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Tunnel fire safety; Double fires; Flame merging; Flame tilt angle; Flame length;

    机译：隧道消防安全;双射击;火焰合并;火焰倾斜角;火焰长度;

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