主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (1): 29-33.

• • 上一篇    下一篇

自然通风下隧道贴壁双火源火焰融合特性研究

彭 伟，刘贤浩，张少杰，柯 陈
  

  1. （安徽理工大学 安全科学与工程学院，安徽 淮南 232001）
  • 出版日期:2023-01-15 发布日期:2023-01-15
  • 作者简介:彭 伟（1981- ），男，安徽淮南人，安徽理工大学安全科学与工程学院消防系主任，博士，副教授，主要从事火灾防治理论与技术、安全评价理论与方法等研究，安徽省淮南市田家庵区泰丰大街168号，232001。
  • 基金资助:
    国家自然科学基金青年基金（52104178）

Study on flame merging characteristics of double fires attached to wall in a naturally ventilated tunnel

Peng Wei, Liu Xianhao, Zhang Shaojie, Ke Chen
  

  1. （School of Safety Science and Engineering, Anhui University of Science and Technology, Anhui Huainan 232001, China）
  • Online:2023-01-15 Published:2023-01-15

摘要：

由于隧道内贴壁双火源火灾的特殊性，其火焰的特征与开放空间及非贴壁情况下的火灾有显著不同。文章在自然通风的矩形缩尺寸隧道模型内进行了一系列试验，结果表明：随火源间距 s 增大，火焰高度 Hf 先短暂增大后持续减小，最后趋于定值。相同火源尺寸下，隧道内贴壁双火源的火焰高度是贴壁单火源火焰高度的 1.2~1.4 倍。相同工况下，由于贴壁情况下的火焰羽流卷吸受限，双火源的火焰高度比位于中轴线情况下高 15%~17%。与火源位于开放空间和隧道中轴线的情况相比，贴壁火源的最大火焰高度更高。基于空气卷吸理论推导了融合火焰高度Hf的经验公式，确定了无量纲间距为 1.8 时 Hf最低。

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Abstract:

Due to the particularity of double fires attached to the tunnel wall, its flame characteristics are quite different from those in open space or no wall attached fires. A series of experiments were carried out in the naturally ventilated rectangular reduced size tunnel model. It is shown that with the increasing of fires spacing s, the flame height Hf first increases slightly, then decreases continuously, and remains stable finally. Under the same fire source size, double fires attached to the wall is 1.2 ~1.4 times the flame height of single fire attached to the wall. Under the same conditions, due to the limited entrainment of flame plume when attached to the wall, the flame height of double fires is 15% ~ 17% higher than that at tunnel central axis. The maximum flame height of fires attached to the wall is higher
than that at tunnel central axis or open space. Based on air entrainment theory, the empirical formula for calculating the merged flame height Hf is established, which shows that Hf gets the minimum value when the dimensionless spacing is 1.8D.

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