排烟口间距对隧道集中排烟烟气层吸穿影响的模拟

发布时间：2018-02-21 11:20

本文关键词： 安全工程集中排烟吸穿排烟口间距数值模拟　出处：《安全与环境学报》2014年06期 　论文类型：期刊论文

【摘要】：吸穿现象的发生将降低隧道集中排烟效率。排烟口间距是影响烟气层吸穿的重要因素。以长22 m的1∶20缩尺寸集中排烟隧道模型为数值模拟研究对象。采用对称方式开启6个排烟口进行双向均衡排烟模式。比较了排烟口间距分别为3 m和2 m时的烟气蔓延范围、烟气层温度和厚度,分析了烟气层厚度、温度与排烟速率之间的关系。结果表明:排烟速率大到一定程度时会导致烟气层吸穿;排烟口间距越大,导致排烟口开始发生吸穿的排烟速率越小;同一排烟速率下,排烟口之间的间距越大,越远离火源的排烟口越容易发生吸穿。因此,为避免吸穿现象的发生,需选取合适的排烟速率及排烟口间距。
[Abstract]:The occurrence of entrainment will reduce the efficiency of centralized exhaust smoke in the tunnel. The distance between the flue gas outlets is an important factor affecting the smoke layer penetration. The 1:20 condensed tunnel model with a length of 22 m is taken as the numerical simulation object. The symmetrical square is used as the object of numerical simulation. The spread range of flue gas with the distance of 3 m and 2 m was compared. The temperature and thickness of flue gas layer are analyzed, and the relationship between smoke layer thickness, temperature and smoke exhaust rate is analyzed. Under the same exhaust rate, the greater the distance between the vents, the more likely it is to be sucked away from the source of fire. Therefore, in order to avoid the phenomenon of aspiration, It is necessary to select the appropriate exhaust rate and smoke outlet spacing.
【作者单位】：中铁第四勘察设计院集团有限公司城市轨道与地下工程设计研究院;武汉科技大学资源与环境工程学院;北京工业大学建筑工程学院;中南大学土木工程学院;
【基金】：中国博士后科学基金项目(2013M540830) 北京市博士后科研活动经费资助项目(2013ZZ-02) 中国科学技术大学火灾科学国家重点实验室开放课题(HZ2013-KF01) 中铁第四勘察设计院集团有限公司课题(2011K51)
【分类号】：U458;X932

【相似文献】