室外风对高层建筑着火层烟气扩散的影响分析

发布时间：2018-01-14 11:00

本文关键词：室外风对高层建筑着火层烟气扩散的影响分析　出处：《消防科学与技术》2017年09期 　论文类型：期刊论文

【摘要】：以某15层的长廊型高层办公楼为研究对象,采用FDS对不同风向和风速的条件下火灾烟气运动情况进行模拟,研究着火房间外开口处中性面高度以及着火层长廊内CO2质量分数变化规律。风速为0.5、1.0、2.0、3.0、4.0 m/s。研究结果表明:正风向和侧风向吹向着火房间时,随着风速的增加,着火房间外开口中性面都有所提升,且正风向更加明显,最高可提升21.3%。而背风向时,随着风速的提高,着火房间外开口处中性面明显降低,最高可降低71%。正风向时,着火楼层长廊内的CO2浓度随着风速的增加有明显的提高;而在侧风向和背风向的情况下,随着外界风风速的增大,长廊内的CO2质量分数降低。且当背风向的外界风风速为3 m/s时,长廊内的CO2质量分数即小于2×10-3。
[Abstract]:Taking a 15-story corridor high-rise office building as the research object, FDS was used to simulate the fire smoke movement under different wind direction and wind speed. The variation of neutral surface height and mass fraction of CO2 in the gallery of ignition layer was studied. The results show that when the positive wind direction and the side wind direction blow to the fire room, the neutral surface outside the fire room increases with the increase of the wind speed, and the positive wind direction is more obvious. With the increase of the wind speed, the neutral surface of the opening outside the fire room is obviously decreased, and the maximum value can be reduced by 71.When the wind direction is positive. The concentration of CO2 in the long corridor of the fire floor increases obviously with the increase of wind speed. However, the mass fraction of CO2 in the promenade decreases with the increase of the external wind speed and the leeward wind direction, and when the outside wind velocity in the leeward direction is 3 m / s. The mass fraction of CO2 in the promenade is less than 2 脳 10 ~ (-3).
【作者单位】：南京工业大学城市建设学院;南京工业大学江苏省城市与工业安全重点实验室;南京工业大学安全工程学院;
【基金】：国家自然科学基金青年科学基金资助项目“风环境下高层建筑外开口烟气溢流行为与扩散特性研究”(51408306);国家自然科学基金资助项目“高层建筑火灾时走廊-前室缓冲区防烟机理研究”(51478219)
【分类号】：TU998.1
【正文快照】： 火灾发生后,着火房间内的温度和压力会急剧增加,可能导致着火房间发生爆炸,门窗破裂,使高层建筑由原来的封闭或半封闭状态转变为开放状态,室外风从开口处进入室内,不但会加剧火势燃烧,短时间内释放更多的烟气,更会加快烟气的扩散速率。运用FDS对外界风的影响下高层建筑外开口

【相似文献】