摘要
表述了几种常见的火蔓延模型,在传热分析的基础上,建立了一个比较理想的物理和数学模型,导出了描绘坡度火蔓延过程的微分方程及其初始、边界条件,并进行了数值计算.在燃料床上模拟了坡度地表火蔓延过程,通过对实验数据的测取和分析,讨论了火蔓延速率和温度场分布等随坡度大小变化的关系.最后将实验结果和理论计算结果对比分析,发现该模型能够揭示火蔓延规律,同时也得出了一些关于林火蔓延的结论,如上坡火能够加速火的蔓延和转化等.
Several popular fire spread models were described. Based on the analysis of heat transfer, a physical and mathematical model was concluded to describe the fire spread across a fuel bed under slope effect. Some linear, partial differential equations with initial and boundary conditions were developed for numerical simulation. Furthermore, the courses of fire spread in small slope were simulated in fuel bed. Through the experimental data recorded by thermocouples, the relationship among ROS (rate of fire spread), temperature field and slope was found and discussed with different figures. Finally, results of experiment and numerical simulation were compared and analyzed. The model can be used to discover the law of fire spread. Some other conclusions on fire spread are also drawn. For example, up-slope fire can accelerate the course of fire spread and translation and so on.
出处
《燃烧科学与技术》
EI
CAS
CSCD
2003年第3期219-223,共5页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(59976039).
