阻火器壳体结构与爆轰火焰状态关系研究

The Study of the relationship between the structure of the fire arrester shell and the state of the detonation flame

摘要:

针对大型煤矿瓦斯运输管道甲烷爆轰过程中火焰压力波和速度与阻火器结构的匹配问题，对阻火器壳体结构变化与管道内火焰压力和速度的关系进行了仿真研究，仿真中对不同尺寸的阻火器壳体结构建立了二维几何模型和网格模型，采用RNC k-e湍流模型和通用有限速率燃烧模型，运用FLUENT软件对煤管内可燃气体爆轰过程进行了模拟. 得到了阻火器壳体内径尺寸、阻火器内有无障碍物与爆轰火焰压力和速度的变化规律，通过分析阻火器内火焰速度和压力的规律，为管道爆轰阻火器的设计和选型提供更为准确的参考依据.

Abstract:

In view of the matching problem of flame pressure wave and velocity with the structure of fire arrester in the process of methane detonation, the authors conducted simulation study to analyses the relationship between the structural change of flame arrester housing and the pressure and speed of flame in the pipeline. During the simulation progress, two-dimensional geometric models and mesh models were built for different sizes of fire arrester shell structure. The RNC k-e turbulence model and the general finite rate combustion model were applied to simulate the detonation process of combustible gas in the coal tube by FLUENT software. We tried to understand the change law of the inner diameter of the flame arrester shell, the porosity of the flame arrester and the pressure and velocity of the detonation flame by analyzing the law of flame velocity and pressure in the flame arrester. The results provide us with an accurate reference for the design and selection of the pipe detonation arrester.