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 (11): 1493-1499.

• • 上一篇    下一篇

封堵条件对倾斜隧道火灾顶棚温度分布的影响

张汉1, 徐柳2, 王飞1, 赵胜中1   

  1. （1. 山东建筑大学 热能工程学院，山东 济南 250101；2. 中机国际工程设计研究院有限责任公司，湖南 长沙 410018）
  • 出版日期:2023-11-15 发布日期:2023-11-15
  • 作者简介:张 汉（1997- ），男，山东枣庄人，山东建筑大学热能工程学院硕士研究生，主要从事隧道火灾方面的研究，山东省济南市凤鸣路1000号，250101。
  • 基金资助:
    国家自然科学基金项目（52208115）；山东省自然科学基金项目（ZR2020QE279）

Influence of sealing conditions on the temperature distribution under the tunnel ceiling in inclined tunnel fires

Zhang Han1, Xu Liu2, Wang Fei1, Zhao Shengzhong1   

  1. (1. School of Thermal Engineering, Shandong Jianzhu University, Shandong Jinan 250101, China; 2. China Machinery International Engineering Design & Research Institute Co., Ltd. (CMIE), Hunan Changsha 410018, China)
  • Online:2023-11-15 Published:2023-11-15

摘要： 采用小尺寸试验的研究方法，考虑不同封堵条件、火源热释放速率和隧道坡度的影响，研究了高、低端出口封堵对倾斜隧道火灾烟气扩散和隧道顶棚温度分布的影响。结果表明：当隧道低端出口封堵时，烟气层近似与隧道底板平行，顶棚最高温升受隧道坡度的影响较小。当隧道高端出口封堵时，烟气层交界面近似水平，顶棚最高温升随隧道坡度的增大而升高。两种封堵条件下，倾斜隧道火灾顶棚纵向温度分布在隧道开敞侧均呈指数衰减。隧道高端出口封堵时，坡度对顶棚温升衰减规律特性的影响较大。相反，坡度对低端出口封堵隧道顶棚温升衰减规律特性的影响较小。综合考虑封堵条件、热释放速率和隧道坡度的影响，建立了最高烟气温升和顶棚温度纵向衰减的预测模型。

关键词: 隧道火灾, 封堵条件, 隧道坡度, 烟气扩散, 温度分布

Abstract: The model-scale experiment method was used to study the fire smoke diffusion and temperature distribution under the ceiling in an inclined tunnel with the upper or lower portal sealed, considering different sealing conditions, heat release rates and tunnel slopes. The results show that when the lower portal is sealed, the smoke layer is approximately parallel to the tunnel floor, and the slope has little effect on the maximum temperature rise. When the upper portal is sealed, the smoke layer interface is almost parallel, and the maximum temperature rise increases with the tunnel slope. The longitudinal temperature distribution under the ceiling in inclined tunnel fires exhibits exponential decay under different sealing conditions. The tunnel slope has a great influence on the temperature decay under the ceiling in upper-portal-sealed tunnels. On the contrary, the slope has little influence on the longitudinal temperature decay in lower-portal-sealed tunnels. Finally, some comprehensive empirical formulas are established to estimate the ceiling maximum temperature rise and the temperature decay taking sealing conditions, heat release rates and tunnel slopes into consideration.

Key words: tunnel fire, sealing condition, tunnel slope, smoke diffusion, temperature distribution