突出冲击气流形成及传播规律数值模拟研究  

Numerical simulation research on formation and propagationlaw of outburst impact airflow

作　　者：戴林超[1,2] Dai Linchao(State Key Laboratory of Gas Disaster Monitoring and Emergency Technology,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《能源与环保》2023年第7期10-14,共5页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家自然科学基金项目(51974358,52104239);重庆市自然科学基金面上项目(CSTB2022NSCQ-MSX1080)。

摘　　要：为了探究煤与瓦斯突出冲击气流在巷道内的传播规律,运用Fluent数值模拟软件研究了突出冲击气流在巷道内的运动过程,分析了不同时刻突出冲击气流压力、速度及突出瓦斯浓度在巷道内的变化情况,获得了突出冲击气流在巷道内的形成及传播规律。结果表明,突出发生瞬间,由于高压瓦斯气体的急剧膨胀,在巷道内形成了超音速运动的突出冲击气流;突出瓦斯气体的运移速度要比突出冲击气流的传播速度小得多,在突出口附近形成了高浓度瓦斯区域;突出冲击气流压力与初始瓦斯压力呈正比关系,突出冲击气流在巷道内的传播是一个不断衰减的过程;突出发生前期,在突出口附近,突出瓦斯气体的运移方式以驱替运移为主,当高压瓦斯气体完全膨胀做功后,突出瓦斯气体的运移方式以自由扩散为主。In order to explore the propagation law of coal and gas outburst impact airflow in the roadway,the Fluent numerical simulation software was used to study the movement process of the outburst impact airflow in the roadway,and the pressure,velocity and mass fraction of outburst gas at different times in the roadway were analyzed.The formation and propagation laws of prominent impact airflow in the roadway were obtained.The results show that at the moment of the outburst,a supersonic impulsive airflow is formed in the roadway due to the rapid expansion of the high-pressure gas.The transport speed of the outburst gas is much lower than that of the outburst impact airflow,and a high concentration gas region is formed near the outburst mouth.The pressure of the outburst impact airflow is proportional to the initial gas pressure,and the propagation of the impulsive air in the roadway is a process of constant attenuation.In the early stage of the outburst,near the outburst mouth,the migration mode of the outburst gas is mainly displacement.When the high-pressure gas fully expands and does work,the migration mode of the outburst gas is mainly free diffusion.

关 键 词：煤与瓦斯突出 冲击气流 FLUENT 数值模拟 传播规律 

分 类 号：TD713[矿业工程—矿井通风与安全]