【作者】 李明明；

【导师】 吴晋湘；

【作者基本信息】 河北工业大学 ， 热能动力工程， 2007， 硕士

【摘要】 本文在国家重点基础研究发展规划(973)的资助下完成了室内燃气火灾轰燃现象的研究。在以往工作的基础上,对大箱体轰燃现象进行研究,提出了局部轰燃现象的定义,并从压力和温度的角度定义了局部轰燃发生的过程,并分析了过程中各个参数的变化。根据实际火灾场景进行了抽象,简化,建立计算采用的物理模型,用FLUENT6.1进行可燃气体在室内泄露及燃烧过程的数值模拟,并在以往数值模拟的基础上进行了更接近真实燃烧的多步反应的模型建立和模拟工作。通过分析数值模拟试验得到的大量数据,提出了针对大箱体情况的局部轰燃和压力诱导核心的概念,并提出局部轰燃发展的四个阶段,即点火期、预混火焰扩散期、局部轰燃期、熄火期。经过实验和数值计算的比较,结果表明实验与数值模拟基本吻合,变化趋势一致,说明采用这种数值模拟的方法来研究火灾现象是可行的。更多还原

【Abstract】 Supported by the National Basic Research Program of China (973), the study on flashover of indoor gas fire was achieved with the method of numerical simulation and experiment.With the supporting and former work,we definite the gaseous flashover in specifical space by studying the phenomenon of gaseous flashover in a big box,and describe the progress of the phenomenon by the change of the pressure and temperature.In this paper, a physical model was founded from the real fire scene. Then, the process of leakage and combustion of the indoor fuel gas was simulated by FLUENT6.1 software and on the base of former work we establish a model of fire whose chemistry equation have much steps ,which is more close to the exact combustion ,and simulate the flame.With a great lot of data gotten from the numerical simulation,we put forward two concepts,one is flashover in special space ,another one is the space in which pressure is the major factor to the other variable. In the same time,we divide the progress of the flashover into special space to four periods,ignition, diffusion of premix flame,flashover in special space,extinguishing.Verified by the experiments, a conclusion was gained that the numerical simulation results well agree with the experiment which mean that study on the gaseous fire with the numerical simulation method was satisfying.更多还原