摘要
为研究上行通风网络火灾中并联旁侧支路风流逆转次序的问题,设计并制作了一个包含3条并联支路的小型模拟实验台.在其中1条支路中设置了燃烧器,用来模拟火灾支路;另两条模拟旁侧支路。取旁侧支路长度及初始风速(点火前的风速)的不同组合,分别进行模拟实验.利用热线风速仪和烟迹观测了两条旁侧支路中风流逆转的过程.结果表明:上行风流火灾中两条并联的旁侧支路可以在不同时刻发生风流逆转;风流逆转次序取决于两条支路长度与初始风速的乘积之比;长度与初始风速乘积较小的支路将较早发生风流逆转.
Air flow reversal in two ascensional airways parallel to a third on fire was studied by constructing a bench model. The model consisted of three tubes connected in parallel. One tube contained a burner to model the fire. The flow in the other two tubes was monitored with hotwire anemometers and by smoke tracing. A series of tube lengths and initial flow velocities was studied and the time for flow reversal was determined. The results show that the flow reverses after different times depending upon the product of flow-tube length and initial flow velocity. The smaller this product the sooner the airflow will reverse in that tube.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第4期467-470,493,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50376070
50534090)
教育部留学回国人员科研启动基金项目(2009-099-3558)
关键词
通风网络
隧道火灾
旁侧支路
风流逆转
实验
ventilation network
tunnel fire
airway parallel to fire
flow reversal
bench experiment
