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 ›› 2021, Vol. 40 ›› Issue (2): 175-179.

• • 上一篇    下一篇

侧部重点排烟与水喷淋协同作用下隧道烟气运动研究

姜学鹏1,2,3，刘婵1,2，于思维1,2，王宝伟1,2   

  1. 1. 武汉科技大学资源与环境工程学院，湖北武汉430081；2. 武汉科技大学消防安全技术研究所，湖北武汉430081；3. 湖北省工业安全工程技术研究中心，湖北武汉430081
  • 出版日期:2021-02-15 发布日期:2021-02-15
  • 作者简介:姜学鹏（1976-），男，山东平度人，武汉科技大学资源与环境工程学院教授，博导，主要从事隧道及地下空间火灾动力学与防治研究，湖北省武汉市和平大道973 号武汉科技大学（青山校区），430081。
  • 基金资助:
    国家自然科学基金项目（51874213，51806156）；湖北省自然科学基金项目（2018CFB185,2018CFB226）

Study on the effect of water spray on smoke layer stability under side exhaust mode in tunnels

JIANG Xue-peng1,2,3, LIU Chan1,2, YU Si-wei1,2, WANG Bao-wei1,2   

  1. 1. School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Hubei Wuhan 430081, China; 2. Fire Safety Technology Institute, Wuhan University of Science and Technology, Hubei Wuhan 430081, China; 3. Hubei Provincial Industrial Safety Engineering Technology Research Center, Hubei Wuhan 430081, China
  • Online:2021-02-15 Published:2021-02-15

摘要：

合理的水喷淋设计参数及排烟策略，可保证隧道有效排烟和烟气层的稳定性，为人员安全疏散提供有利环境。为研究侧部排烟模式下烟气失稳临界状态时最佳喷水流量和排烟口设计参数，采用FDS 对15 MW 火灾规模下，不同喷水流量、排烟量、排烟口间距及排烟口高度下19 组工况进行模拟计算。结果表明：喷淋流量越大，烟气层高度越高，隧道整体温度降低，改变喷水流量对控制烟气层的稳定性效益不大，隧道空间内有烟气滞留；排烟量为70 m3/s、排烟口间距为50 m、排烟口高度为3.2 m 或4.0 m 为烟气层稳定临界状态时的排烟口最佳参数，此时侧部抽吸力向上的分力与烟气的热浮力大于水喷淋拽曳力，烟气层较稳定，隧道空间内无旋涡烟气滞留，有利于排烟和人员疏散。

关键词: 侧部重点排烟, 水喷淋, 烟气层稳定性, 数值模拟

Abstract:

Reasonable water spray design parameters and smoke exhaust strategy can ensure the effective smoke exhaust and smoke layer stability of the tunnel, and provide a favorable environment for the safe evacuation of personnel. In order to study the optimal water spray flow rate and smoke vent design parameters when the smoke loses the stable critical state in the side smoke exhaust mode, FDS was used for a 15 MW fire scale with different water spray flow rate, smoke exhaust volume, distance or height of smoke exhaust vent. 19 groups of working conditions with different spray flow, smoke exhaust flow, distance or the height of the smoke exhaust port are simulated and calculated. The results show that: the greater the spray flow, the higher the height of the smoke layer, the lower the overall temperature of the tunnel, and the change of the spray flow has a little effect on the stability of the smoke layer, there is smoke retention in the tunnel space. The smoke exhaust port is 70 m3/s, the exhaust port spacing is 50 m, and the exhaust port height is 3.2 m or 4.0 m, which is the best parameter of the exhaust port when the smoke layer is in a critical state. At this time, the side suction force upward component and the thermal buoyancy is greater than the drag force of the water spray, the smoke layer is relatively stable, and there is no swirling and smoke retention in the tunnel space, which is beneficial for smoke exhaust and personnel evacuation. 

Key words: side point smoke extraction, water spray, smoke layer stability, numerical simulation