宽度与角度耦合作用下固体表面火蔓延加速特性  

The Coupling Effects of Sample Width and Angle on Flame Spread Acceleration Over Solid Surfaces

作　　者：张英[1] 郭贤 毛少华[2] 陈月[1] 申世飞[3] ZHANG Ying;GUO Xian;MAO Shao-Hua;CHEN Yue;SHEN Shi-Fei(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430070,China;Chinese Ship Design and Research Center,Wuhan 430064,China;Department of Engineering Physics,Tsinghua University,Beijing 100083,China)

机构地区：[1]武汉理工大学安全科学与应急管理学院,武汉430070 [2]中国舰船研究设计中心,武汉430064 [3]清华大学工程物理系,北京100083

出　　处：《工程热物理学报》2020年第5期1239-1246,共8页Journal of Engineering Thermophysics

基　　金：国家重点研发资助项目(No.2016YFC0802807);国家自然科学基金资助项目(No.51404178,No.51706164)。

摘　　要：研究了杉木和樟木两种典型的可碳化固体表面在不同试样宽度和不同放置角度的火蔓延加速特性.试样宽度范围为2~12 cm,每间隔2 cm为一组工况;放置角度为-20°~30°,正角度每间隔10°为一组工况,负角度每间隔5°为一组工况。通过分析试样表面火焰蔓延速度、火焰特征参数(火焰形态、火焰面积、火焰温度)及试样质量损失速率等的变化规律,观察火蔓延特性。研究发现,火蔓延速度、质量损失速率及火焰面积均随着试样宽度和放置角度的增大而增大;试样宽度对火蔓延发生加速行为的临界角度有影响,并揭示了试样宽度对火蔓延加速行为的影响机制;得到了火蔓延过程在试样宽度和放置角度耦合作用下的稳态蔓延和加速蔓延之间的临界条件。The flame spread acceleration characteristics of two typical carbonizable solid surfaces of Chinese fir and camphor wood in different sample widths and different inclined angles were studied.The width of the sample ranges from 2 cm to 12 cm,and each interval is 2 cm for a group of working conditions;the inclined angle is-20°~30°,the positive angle is 10°for each group of working conditions,and the negative angle is 5°for each group of working conditions.The flame spread characteristics were observed by analyzing the flame spread rate of the sample surface,the flame characteristic parameters(flame shape,flame area,flame temperature)and the mass loss rate of the sample.It is found that the flame spread rate,mass loss rate and flame area increase with the increase of sample width and inclined angle.The width of the sample has an influence on the critical angle of the accelerated behavior of the flame spread,and reveals the influence mechanism of the sample width on the accelerated behavior of the flame spread.The critical condition between steady-state propagation and accelerated propagation under the coupling of sample width and placement angle is obtained.

关 键 词：试样宽度 放置角度 火蔓延速度 加速突变 临界条件 

分 类 号：TK121[动力工程及工程热物理—工程热物理]