摘要
为揭示航空煤油相向传播火焰融合过程表面流和油面温度变化规律及成因,在自行研制的液体火蔓延试验台上开展系列试验,利用纹影系统实时记录相向表面流的全过程,采用微细热电偶和红外摄像技术测量燃油不同位置点与油面中心线上温度分布。结果表明:航空煤油两端同步蔓延条件下,相向表面流在融合过程中具有融合-停滞-分离的运动轨迹;在远离融合界面的油面处,其温升规律几乎与单端火蔓延一致,具有一次台阶温升规律;在形成的大涡流周围油面处,具有二次台阶温升规律;融合后期油面突燃现象是二次涡流和预混可燃气共同作用结果。
Experiments were carried out by using a self developed liquid fire spreading test stand.The whole process of surface flow movement was recorded by a schlieren system.Temperature distributions at different points of fuel and on the central line of fuel surface were measured by micro thermocouples and infrared photography.The resuhs show that in the circumstance of synchronous ignition at both ends of aviation kerosene,the fusion process of surface flows approaching each other includes three stages :fusion, stagnation and separation,that on the liquid surface far from the flame fusion interface,the temperature rise characteristic is almost the same as that of the single-end fire,it has the characteristic of a step temperature rise,that on the liquid surface around the large eddy current,there is a second step temperature rise,and that the secondary vortex flow and premixed combustible gas can cause the fuel to burst in the later stage of fusion.
作者
周劼波
陈国庆
汪金辉
陆守香
ZHOU Jiebo;CHEN Guoqing;WANG Jinhui;LU Shouxiang(Haishu Branch,Ningbo Fire Detachment,Ningbo Zhejiang 315000,China;State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei Anhui 230026,China;Shanghai Institute of Standards,China Classification Society,Shanghai 200135,China;College of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 200136,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2018年第9期39-44,共6页
China Safety Science Journal
关键词
火蔓延
融合
相向传播
表面流
温度分布
flame spread
fusion
oppositely travelling flame
surface flow
temperature profile
