摘要
根据烟气颗粒在壁面上黏附的机理和影响因素,先建立烟熏图痕形成的半物理模型,再将其与火灾流体模拟软件FDS相耦合,后编译出可以重现烟熏图痕的FDS可执行程序;同时进行了壁面烟熏图痕的实体试验,分析了燃烧时间、火源位置、燃料种类对烟熏图痕形成的影响;而且利用重新编译的FDS程序对实体试验进行了数值重构,对比讨论了实体试验结果与模拟结果。结果表明,嵌入了烟熏半物理模型的程序能较好地重构出试验得到的烟熏图痕,证明了该模型是有效的,可以用于烟熏痕迹的预测。该技术弥补了现有软件的不足,进一步完善了数值重构技术,可以辅助火灾调查工作。
The paper intends to present our research findings in the meehanism of smoke pattern and the numerical reeonstruction mode based on FDS. To aehieve our researeh goal, we have laid out a numerical simulation model and a comprehensive entity experiment wilh the pattern lu analyze Ihe influential factors, thus creating a smoking pattern semi-physical model in accordance with the dimensional analysis method and coupled with the fire dynamics simulator software （FDS） . To be accurale, we have embedded the smoking pattern semi-physical model into the 26 FDS 5.0.0 source code files and recompile it into a new FDS executable diagram that helps to predict the smoke patterns. At the same time, based on the features and the formation mechanism of smoke patterns and the charaeteristies of smoke traces which we have researched, a comprehensive entity experiment for the wall smoking pattern by taking a fireproof board as the wall material and gasoline and diesel as the experiment fuel in setting up the three kinds of working conditions in different burning times, dif- ferent fire source locations and the different fuel types is laid out. The results of the above said experiment has enabled us to make clear the influential effects of the three working conditions on the smoke pat- tern. The parameters of the experimental fire scenarios turn out to be in perfect accord with the actual situations of the entity experiments, the related grid independence tests and the adjustments of the time sequence of the fire scenarios. And, next, we have reconstructed the experiment methods and made the simulation results by using the re- compiled FDS program. The results of our comparative study of the entity experiment and the numerical simulation demonstrate that the FDS program coupled with the semi-physical model contributes greatly to the reconstruction of the smoke pattern and in turn proves the validity of the model. The fire and smoke fighting technology including the deficiencies of the same type of currently existing software, and consequently has improved the numerical power of the reconstruction technique, thus pushing forward the application of the technology to the fire fighting field and effectively heightening the firefighting theory and technology in the given field.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第6期102-106,共5页
Journal of Safety and Environment
基金
公安部应用创新计划项目(2011YYCXWJXY134)
关键词
安全工程
数值重构
烟熏图痕
FDS
半物理模型
safety engineering
numerical reconstruction
smoke pattern
FDS
semi-physical model
