煤田火区是半封闭多孔介质中的多场耦合的复杂动力系统，目前对火区渗流还没有较完善的理论，因此研究煤田火区多孔介质渗流规律、掌握火区流动发展变化规律具有重要意义。 本文以汝箕沟煤田上一火区为研究对象，采用实验研究、理论分析和数值模拟相结合的方法对火区渗流规律进行了研究，主要进行了以下几个研究： （1）设计了松散煤体空气渗透实验装置，针对不同粒径、不同级配的煤样，计算混合煤样的级配分维，测定煤样渗透系数，得出煤粒粒径对空气渗流的影响关系，引用的参数级配分维能较全面的反应火区松散煤体渗透性质，并确定了级配分维与渗透系数的函数关系。 （2）利用程序升温实验装置测算了不同煤温下的耗氧速率及放热强度，确定了煤体粒度影响函数。 （3）简化建立了汝箕沟煤田上一火区物理模型，以传热传质学理论及多孔介质渗流理论建立了火区温度场、氧浓度场及漏风流场的二维数学模型，对火区物理模型进行了网格划分，确定了其边界条件。 （4）应用Fluent对火区火源温度在334K、374K、414K、434K和入口风速在0.2m/s和0.5m/s条件下的漏风流场、温度场及氧浓度场进行了数值模拟，对模拟结果进行理论分析，研究火区的热-流耦合作用，揭示了火区漏风流场、温度场及氧浓度场的变化规律。

The coalfield fire is a complex dynamic system which is a field coupling in semi-closed porous medium. At present,the seepage in fire zone haven't more perfect theory.So it is important to study the law of seepage in coal fire zone and master the law of development and changes in fire zone. In the article,the Shangyi fire zone in Rujigou coalfield was taken as example. Methods of experiment, theoretical analysis and numerical simulation were combined to study the law of seepage in coal fire zone, carry out the following research work: (1) Set up the air seepage of loose coal experimental device.Determine the permeability coefficient of coal which is different size and grading,calculated the graded fractal dimension of mixed coal, determined the permeability coefficient of coal,quoted the graded fractal dimension can comprehensively react the law of seepage in loose coal, fitted the function of fractal dimension of graded and permeability coefficient. (2) Research the oxidation and heat features of the coal in fire zone by the device of temperature-programmed.Determine the oxygen uptake rate and heat intensity of different coal temperature,fitted the influence function of particle size. (3) Establish the physical model of fire zone based on the actual situation.The two-dimensional mathematical model of the temperature field,the oxygen concentration field and the airflow field was established by the percolation theory with porous medium,heat transfer theory and mass transfer theory,determined the boundary conditions. (4) Based on the experiment research and the mathematical model.After the hypermesh and set boundary,the airflow field,the oxygen concentration field and the temperature filed of the fire zone were simulated by Fluent under the temperature at 334K,374K,414K,434K and the wind speed at 0.2m/s,0.5m/s.The simulation results were analysed by theoretical.Reveal the variation of the airflow field, the oxygen concentration field and the temperature filed of the fire zone.