基于FireFOAM的火焰加速突变行为的数值模拟  

Numerical Simulation of Flame Acceleration Characteristics based on FireFOAM

作　　者：林一凡 张英[1] 张威[1] 廖明静[1] LIN Yi-fan;ZHANG Ying;ZHANG Wei;LIAO Ming-jing(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430070,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

出　　处：《爆破》2020年第2期149-157,共9页Blasting

基　　金：国家自然科学基金(51706164)。

摘　　要：为了研究倾斜固体表面顺流火焰蔓延的突变行为特性,基于OpenFOAM开源计算流体软件的FireFOAM瞬态湍流火焰求解器,以典型可炭化材料瓦楞纸为原型,分析了倾斜角度为0°到30°范围内火焰形态、质量损失速率和固体表面热量分布的变化规律。结果发现火灾特性参数(火焰倾角和面积)随倾角增加而增加,且在倾斜角度为10°和20°之间存在突变区域。当倾角小于10°时,火焰行为及固体表面接收到的热量分布基本保持不变;当倾角大于20°时,火焰面积及火蔓延速度随时间增大,火焰倾角变化较大且热量分布随时间变化逐渐增加。通过判断未燃区热量分布和温度之间的特征比值的变化趋势,揭示了固体表面倾角与火蔓延突变及加速行为的影响机制。In order to study the mutations characteristics of upward flame spread over the inclined solid surfaces,the FireFOAM transient turbulent flame solver of an open source computational fluid software OpenFOAM was applied to analysis the variation principle of flame shape,mass loss rate and heat distribution on solid surface of a typical carbonized corrugated paper within inclination angle in range of 0°to 30°.It was found that the flame angles and area was increased with the increase of the inclination angle,and there was an acceleration mutation between the inclination angle of 10°and 20°.Moreover,the distribution characteristics of the flame and heat on the solid surface remain basically unchanged when the inclination angle was less than 10°.Meanwhile,the flame area and the spread rate of flame was increased with time,the flame inclination was changed greatly and the heat distribution was increased gradually with time when the inclination angle was greater than 20°.The influence mechanism between flame acceleration and mutation with the inclination angles of solid surface was revealed through analyzing the characteristics of the radio between the heat distribution and temperature of the unburnt zone.

关 键 词：FireFOAM 数值模拟 火蔓延 倾斜表面 加速突变 热量传递 

分 类 号：X932[环境科学与工程—安全科学]