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 ›› 2024, Vol. 43 ›› Issue (7): 913-918.

• • 上一篇    

公路隧道地面效应对双火源火焰合并特性影响的试验研究

彭伟1,2, 张伟2, 谢奇2, 张少杰2   

  1. （1. 安徽理工大学 公共安全与应急管理学院，安徽 合肥 231131；2. 安徽理工大学 安全科学与工程学院，安徽 淮南 232000）
  • 出版日期:2024-07-15 发布日期:2024-07-15
  • 作者简介:彭 伟（1981- ），男，安徽淮南人，安徽理工大学公共安全与应急管理学院教授，主要从事火灾防治方面的研究，安徽省淮南市田家庵区泰丰大街168号，232000。
  • 基金资助:
    基金项目：火灾科学国家重点实验室开放课题(HZ2023-KF08)

Experimental study on the influence of ground effect on the merging characteristics of dual flame sources in road tunnels

Peng Wei1,2, Zhang Wei2, Xie Qi2, Zhang Shaojie2   

  1. (1. School of Public Safety and Emergency Management, Anhui University of Science and Technology, Anhui Hefei 231131, China; 2. School of Safety Science and Engineering, Anhui University of Science and Technology, Anhui Huainan 232000, China)
  • Online:2024-07-15 Published:2024-07-15

摘要： 为研究自然通风隧道内发生双重火灾时地面效应对双火源火焰合并特性的影响，利用1:10小尺寸隧道模型开展了一系列试验。重点探究了双火源表面与隧道地面平齐时火源间距对火焰合并概率与火焰合并点高度的影响。结果表明：火灾烟气从隧道两端开口流出，由隧道两端补充进的新鲜空气产生的风速导致火源间距更大时火焰依然会发生互相倾斜，在间距足够大时，火焰倾斜角度约为10°。引入一个无量纲量表示火焰合并概率随着火源间距、热释放速率的改变而变化的规律。另外，将本文的试验数据与前人的工作做了比较，发现地面效应对隧道纵向布置的双火源火焰合并行为具有极大的促进作用。同时给出了火焰合并点高度与隧道高度的比值与改良后无量纲热释放速率的关系式。

关键词: 地面效应；公路隧道火灾；双火源火灾；火焰合并概率；火焰合并点高度

Abstract: In order to investigate the influence of the ground effect on the flame merging characteristics of dual ignition sources when a double fire occurs in a naturally ventilated tunnel, a series of experiments were carried out using a 1:10 small-size tunnel model. The focus was to investigate the effect of fire source spacing on the flame merging probability and the height of the flame merging point when the surface of the dual fire sources is flush with the tunnel floor. The results show that: fire smoke flows out of the openings at both ends of the tunnel, and the wind speed generated by the fresh air supplemented from both ends of the tunnel causes the flames to still tilt towards each other when the fire sources are more widely spaced, and the flame tilting angle is about 10° when the spacing is sufficiently large. A dimensionless quantity is introduced to represent the law that the flame merging probability varies with the change of fire source spacing and heat release rate. In addition, the experimental data in this paper are also compared with the previous work, and it is found that the ground effect contributes greatly to the flame merging behavior of dual fire sources in a longitudinal tunnel arrangement. The relationship equation between the ratio of the height of the flame merging point to the tunnel height and the modified dimensionless heat release rate is also given.

Key words: ground effect; road tunnel fire; double sources fire; flame merging probability; height of the flame merging point