附加挡板对侧部集中机械排烟吸穿现象的影响研究  

Study on influence of additional baffles on plug-holing phenomenon of side centralized mechanical smoke exhaust

作　　者：王勇[1,2,3] 金钰轩 姜学鹏 WANG Yong;JIN Yuxuan;JIANG Xuepeng(Institute of Safety and Emergency,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;Research Center of Fire Safety,Wuhan University of Science and Technology,Wuhan Hubei 430081,China;School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan Hubei 430081,China)

机构地区：[1]武汉科技大学安全与应急研究院,湖北武汉430081 [2]武汉科技大学消防安全研究所,湖北武汉430081 [3]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《中国安全生产科学技术》2023年第7期141-147,共7页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51874213);湖北省科技计划项目(2020BCB072)。

摘　　要：为抑制公路隧道侧部集中机械排烟时的吸穿现象,优化侧部集中排烟模式,以武汉两湖隧道为例,采用Fluent建立全尺寸模型针对侧部排烟口附加挡板的不同角度,分析排烟口区域流场、温度场以及排烟效率等因素对吸穿现象的影响。研究结果表明:在5,10,15 MW火源功率情况下,附加挡板能有效抑制吸穿现象,挡板与排烟口呈60°时能起到较好的排烟效果;当排烟口温度接近环境温度时判定发生完全吸穿的排烟风速,与烟气层高度不再变化时判定发生完全吸穿的排烟风速一致;在挡板上方提出垂直于侧向排烟口的虚拟排烟口概念后,得出附加挡板侧部排烟的吸穿预测公式,进而得到发生完全吸穿现象时的饱和Fr为13.87。研究结果可为公路隧道侧部集中机械排烟附加挡板的实际工程应用提供一定理论参考。In order to suppress the plug-holing phenomenon in the side centralized mechanical smoke exhaust of highway tunnel and optimize the side centralized smoke exhaust mode,taking the Lianghu tunnel in Wuhan as an example,a full-size model was established by Fluent to investigate the different angles of additional baffles in the lateral smoke vent,and the flow field,temperature field and smoke exhaust efficiency in the smoke vent area were analyzed.The results show that in the cases of 5,10,15 MW fires,the additional baffles can effectively suppress the plug-holing phenomenon,and the baffles can play a better smoke exhaust effect when they are at 60°to the smoke vent.When the temperature of smoke vent is close to the ambient temperature and the height of smoke layer no longer changes,it is judged that the smoke exhaust wind velocity when occurring complete plug-holing is consistent.After proposing the concept of a virtual smoke vent perpendicular to the side smoke vent above the baffles,the prediction formula of plug-holing for side smoke exhaust with additional baffles is obtained,and the saturated Froude number is 13.87 when the complete plug-holing phenomenon occurs.The research results can provide some reference for the practical engineering application of the additional baffles in the side concentrated mechanical smoke exhaust of highway tunnels.

关 键 词：侧部排烟 排烟挡板 吸穿 饱和Fr 

分 类 号：X932[环境科学与工程—安全科学]