顶部构筑物对狭长空间烟气蔓延阻滞机理研究
The retarding mechanism research on smoke movement of top structures in long-narrow space
-
摘要: 为研究火灾产生的烟气越过多个挡烟垂壁等顶部构筑物后的流动规律，采用FSD数值模拟方法，对比狭长空间模型中无挡烟垂壁、单挡烟垂壁和多挡烟垂壁情况下的烟气蔓延情况，并对烟气运移的速度场分布、不同区段流量的变化进行研究.结果表明：在无挡烟垂壁和分别设置1个、2个、4个挡烟垂壁的情况下，烟气到达狭长空间末端的时间分别为15.9 s，17.1 s、18.8 s和25.5 s；挡烟垂壁阻滞烟气蔓延的原因是，挡烟垂壁等构筑物可以减小烟气层与下部空气层的相对流动速度，减少烟气对空气的卷吸，降低烟气生成量；多挡烟垂壁对烟气的阻滞效果优于单挡烟垂壁，烟气蔓延速度更慢.Abstract: In order to study the flow law of smoke generated by fire after passing through several top structures such as smoke barriers,FSD numerical simulation method was used to compare the smoke spreading situation of the long-narrow space model in the case of no smoke barrier,single smoke barrier and multi smoke barrier.The velocity field distribution of smoke migration and the flow rate change in different sections were studied.The results showed that the time for smoke to reach the end of the long-narrow space were 15.9 s,17.1 s,18.8 s and 25.5 s,respectively,in the case of no smoke barrier and 1,2 and 4 smoke barriers.The reason why smoke barriers retarded the smoke spreading was that the top structures such as smoke barriers could reduce the relative flow velocity of smoke layer and lower air layer,which reduced the entrainment of air and the amount of flue gas generated; the retarding effect of multi smoke barrier was better than that of single barrier,and the smoke spreading speed was slower.
-
Key words:
- smoke barrier /
- smoke movement /
- numerical simulation /
- air entrainment
-
-
[1]
WAN H X,GAO Z H,JI J,et al.Predicting heat fluxes received by horizontal targets from two buoyant turbulent diffusion flames of propane burning in still air[J].Combustion and Flame,2018,190:260.
-
[2]
中华人民共和国住房和城乡建设部.建筑设计防火规范:GB 50016-2014[S].北京:中国计划出版社,2018.
-
[3]
中华人民共和国公安部.挡烟垂壁:GA 533-2012[S].北京:中国标准出版社,2012.
-
[4]
SEIKE M,KAWABATA N,HASEGAWA M,et al.The retarding effect of fixed barriers on smoke propagation in tunnel fires[J].Tunneling & Underground Space Technology,2019,85:100.
-
[5]
HUANG J,ZHU G,YU M,et al.Effect of smoke barrier in narrow space on smoke flow utilizing CFD[J].Procedia Engineering,2016,135:142.
-
[6]
王欢,齐庆杰,姜海洋,等.挡烟垂壁作用下狭长通道内烟气输运特征研究[J].中国安全生产科学技术,2017,13(6):150.
-
[7]
李思成,陈颖.高层建筑疏散走道火灾烟气多驱动力作用下运动特性[M].北京:知识产权出版社,2019.
-
[8]
OKA Y,OKA H.Velocity and temperature attenuation of a ceiling-jet along a horizontal tunnel with a flat ceiling and natural ventilation[J].Tunnelling and Underground Space Technology,2016,56(6):79.
-
[9]
ZHAO W F,ZONG R W,WEI T,et al.The physical model and validation study of ceiling-jet flow in near-field of corridor fires[J].International Journal of Heat and Mass Transfer,2015,88(9):91.
-
[10]
YANG Y X,LIU C,LONG Z,et al.Full-scale experimental study on fire under vehicle operations in a sloped tunnel[J].International Journal of Thermal Sciences,2020,158:106524.
-
[11]
KUNSCH J P.Critical velocity and range of a fire-gas plume in a ventilated tunnel[J].Atmospheric Environment,1998,33:13.
-
[12]
KUNSCH J P.Simple model for control of fire gases in a ventilated tunnel[J].Fire Safety Journal,2002,37:67.
-
[13]
高子鹤.隧道内受限火羽流行为特征及竖井自然排烟机理研究[D].合肥:中国科学技术大学,2016.
-
[14]
潘李伟.烟气控制条件下狭长空间烟气分层蔓延特性研究[D].合肥:中国科学技术大学,2011.
-
[15]
纪杰,霍然,张英,等.长通道内烟气层水平蔓延阶段的质量卷吸速率实验研究[J].中国科学技术大学学报,2009,39(7):738.
-
[16]
REVEG A,HASSID S,POREH M.Calculation of entrainment in density jumps[J].Environmental Fluid Mechanics,2006,6(5):407.
-
[17]
CHOTZOGLOUK E,ASIMAKOPOULOUA E K,ZHANG J P,et al.An experimental investigation of burning behaviour of liquid pool fire in corridor-like enclosures[J].Fire Safety Journal,2019,108:102826.
-
[18]
王浩波,纪杰,钟委,等.长通道内烟气一维水平蔓延阶段质量卷吸系数的实验研究[J].工程力学,2009,26(11):247.
-
[1]
-
点击查看大图
计量
- PDF下载量: 18
- 文章访问数: 3108
- 引证文献数: 0
下载:
