基于LBM工作面瓦斯涌出仿真实现  

Simulation of working face gas emission based on LBM

作　　者：黄光球[1] 邢玉飞[1] 

机构地区：[1]西安建筑科技大学管理学院,西安710055

出　　处：《水动力学研究与进展（A辑）》2009年第6期696-704,共9页Chinese Journal of Hydrodynamics

基　　金：教育部高等学校博士点专项基金资助项目(20070703009);陕西省自然科学基金资助项目(2007E217);陕西省教育厅科研计划项目(09JK531)

摘　　要：为了掌握瓦斯在煤层中运移并涌出后在工作面扩散的规律,提出了对工作面瓦斯涌出进行仿真的方法。由于煤层流场是由多孔介质组成的空间,瓦斯在煤层中的运移属于渗流运动,而工作面空间为非多孔介质空间,瓦斯在工作面的扩散属于紊流运动,因此本方法基于双分布速度—浓度格子Boltzmann模型,分别建立了瓦斯在煤层中运移和涌出后在工作面扩散的LBM模型,并采用分块耦合算法,实现了煤层流场和工作面瓦斯流场的耦合。该模型结合生产过程中经常使用的U型通风系统,对瓦斯在煤层中的运移和瓦斯涌出后在工作面的扩散流动进行了模拟。通过模拟可直观地观察瓦斯涌出后在工作面的分布,并得出工作面瓦斯涌出规律,这为进一步探讨煤与瓦斯两相耦合机制、煤与瓦斯突出机制及瓦斯抽放方案的设计提供新的思路。A simulation method of gas emission in working face was proposed in order to master the rules of gas transport in coal seam and gas diffusion in working face after emitting. Gas flow in coal seam belongs to seepage flow because the flow field is constituted by porous media, while the working face field is not the porous media, and the flow is a turbulent motion. For these, two new dynamic models for simulation of gas transport in coal seam and gas diffusion in working face after emitting were established respectively based on the double distributed Lattice Boltzmann Method （LBM）, the block coupling algorithm was applied to realize coupling of two flow fields in coal seam and in working face. The model simulates gas transport in coal seam and gas diffusion in working face after emitting under the generally used U-type ventilation system.The simulation results demonstrate that gas distribution in working face after gas emitting can be known clearly and the rules of gas emission in working face can be gotten also, it provides a new method to further study coupling theories between coal and gas, and to understanding deeply mechanism of gas outburst and gas drainage.

关 键 词：瓦斯运移 瓦斯涌出 分块耦合算法 格子BOLTZMANN方法 

分 类 号：TD32[矿业工程—矿井建设]