摘要
火灾中机械排烟的速率过大会导致吸穿现象,进而引起排烟效率大大降低,在隧道火灾中,由于没有稳定的蓄烟空间,烟气在隧道中具有定向的流动,吸穿现象的发生与中庭中不同。根据质量守恒定律分析了隧道火灾机械排烟的吸穿现象,得到隧道火灾中机械排烟的临界Froude数值为1.8。为了检验该结论,利用数值模拟分析了几种典型的隧道火灾机械排烟工况,模拟结果表明该结论可以很好地判定隧道火灾机械排烟的吸穿现象。
When the plug - holing occurs in tunnel fire mechanical ventilation,it will significantly reduce the efficiency of ventilation. In the tunnel fire,there is no stable smoke space,flue gas in the tunnel with directional flow,the phenomenon of suction wear and atrium in the different. According to the lawof conservation of mass,the suction of the mechanical exhaust is analyzed,and the critical Froude value of the mechanical exhaust is 1.8. In order to test the result,several kinds of typical me-chanical smoke exhausting conditions of tunnel fire are analyzed by numerical simulation. The simulation results show that the conclusion can be used to judge the suction of mechanical smoke in tunnel fire.
出处
《武汉理工大学学报（信息与管理工程版）》
CAS
2016年第6期656-661,共6页
Journal of Wuhan University of Technology：Information & Management Engineering
基金
国家自然科学青年基金项目(51508065)
中国科学技术大学火灾科学国家重点实验室开放课题基金项目(HZ2015-KF05)
重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地开放课题基金项目(CQSLBF-Y15-10)
重庆市教委科学技术研究资金项目(KJ1500509)
关键词
隧道火灾
排烟效率
吸穿
火灾安全
tunnel fire
efficiency of mechanical smoke extraction
plug - holing
fire safety
