摘要
当发生隧道火灾时,纵向通风方式常被用于人员疏散和排烟,而纵向风速较大时,烟气将发生分岔流动,导致烟气层整体性被破坏,对人员疏散造成威胁.火源横向位置对隧道火灾烟气流动有显著影响,通过数值模拟对不同火源横向位置时烟气分岔流动特性进行了研究.结果表明,随着火源向侧壁靠近,烟气由对称型分岔流动转变为不对称分岔流动.当火灾发生在侧壁附近时,烟气转变为"S"型流动.随着火源与侧壁间距的减小,分岔流动临界风速呈指数型增加.
When a fire occurd in tunnel,the longitudinal ventilation was used for personnel evacuation and smoke extraction. The stratification of smoke layer would be destroyed under high ventilation velocity,and would lead to smoke bifurcation flow,which was harmful to evacuation. The numerical simulations were conducted to investigate the influence of transverse fire locations on smoke bifurcation flow. The phenomena of smoke bifurcation flow with different transverse fire locations were studied. The results showed that the bifurcation flow was symmetric when fire located in the central line of tunnel; and a S-shaped flow occursed in a near wall fire situation. The critical velocity of smoke bifurcation flow increased exponentially when fire source moved to the sidewall.
作者
钟委
端木维可
李华琳
梁天水
ZHONG Wei DUANMU Weike LI Hualin LIANG Tianshui(School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2017年第1期27-31,共5页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科学基金资助项目(51404215)
国家博士后基金特别资助项目(2015T80781)
建筑安全与环境国家重点实验室开放课题(BSBE2015-02)
关键词
隧道火灾
数值模拟
分岔流动
横向位置
临界风速
tunnel fire
numerical simulation
bifurcation flow
transverse fire locations
critical velocity
