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 ›› 2020, Vol. 39 ›› Issue (12): 1671-1675.

• • 上一篇    下一篇

Y字型隧道纵向通风排烟临界风速研究

侯立勋1，谢恩2，陶浩文2，徐志胜2   

  1. 1. 南京市公共工程建设中心,江苏南京210004; 2. 中南大学土木工程学院，湖南长沙410075
  • 出版日期:2020-12-15 发布日期:2020-12-15
  • 通讯作者: 徐志胜（1962-），男，中南大学土木工程学院教授，博士。
  • 作者简介:侯立勋（1974-），男，南京市公共工程建设中心高级工程师，学士，主要从事桥梁与隧道防灾减灾方面的研究，江苏省南京市建邺区江心洲街道梅子洲路69号，210019。
  • 基金资助:
    中央高校基本科研业务费专项资金(2019ZZTS075)；湖南省研究生科研创新项目(CX20190131)

Study on the critical velocity of smoke exhaust in a Y-shaped tunnel fire

HOU Li-xun1, XIE En2, TAO Hao-wen2, XU Zhi-sheng2   

  1. 1. Nanjing Public Project Construction Center, Jiangsu Nanjing 210004，China; 2. School of Civil Engineering, Central South University, Hunan Changsha 410075，China
  • Online:2020-12-15 Published:2020-12-15

摘要：

为了研究分岔隧道在采取纵向通风排烟系统时各匝道所需临界风速，设计合流型和分流型两种Y 字型分岔隧道。数值模拟设定30 MW 火灾规模，对比Y 字型隧道各匝道的临界风速与单坡坡度隧道临界风速的理论值，并分别对匝道内2 m 和6.2 m 处的纵向温度进行分析。结果表明，对于非着火匝道，当匝道内的临界通风风速与单坡度隧道的理论值相当时，能保证烟气不通过岔口蔓延到该匝道；对于合流型隧道的着火匝道，其临界风速小于单坡度隧道的临界风速理论值；分流型隧道的着火匝道所需临界风速大于同等单坡度隧道的临界风速理论值。

关键词: Y 字型隧道, 纵向通风, 坡度, 数值模拟, 临界风速

Abstract:

In order to reveal the critical velocity in an underground interchange tunnel with the longitudinal ventilation, two types of Y- shaped tunnels, the merging type and the diverging type, were studied. 30 MW heat release rate was setted，and the critical velocity in each ramp of Y- shaped tunnels was compared with the normal single-slope tunnel. In addition, the longitudinal temperature distribution at 2 m and 6.2 m in the ramp was analyzed. The results showed that, in the unfired ramp of the Y-shaped tunnel, the critical velocity is equivalent to the theoretical value of critical ventilation in the single- slope tunnel. For the fired ramp, the critical velocity of the merging type is less than the theoretical value, on the contrary, the critical velocity of the diverging type is greater than the theoretical value in the single-slope tunnel.  

Key words:

Y-shaped tunnel；longitudinal ventilation；slope；numerical study；critical velocity  ,