Flow field and gas concentration distribution in the coal mining face and mined-out area with J-Shape and U-Shape ventilation system using Comsol

Under different ventilation system, the flow field and gas concentration distribution characteristics of coal mining face are different. Taking U-Shaped and J-Shape ventilation as an example, the physical model of gas flow in coal mining face and mined-out area was established by COMSOL Multiphysics multi-physics coupled analysis software. The distribution of the flow field and gas concentration in the coal mining face and mined-out area are numerically simulated. The simulation results show that, under U-Shape ventilation, there are three gas accumulation sites in the coal mining face and only one in J-Shape ventilation. And in the J-Shape ventilation conditions, can change the upper corner of the flow field, thus effectively solving the J-Shaped ventilation conditions, the upper corner of the gas accumulation problem. (paper)