综放采空区瓦斯流动规律数值模拟研究

采用Fluent模拟软件，选择标准双方程模型，对u型和U＋L型通风方式下综放采空区瓦斯流动进行数值模拟，研究其分布规律。模拟结果表明：在走向方向上，从自然堆积区到压实稳定区，在倾斜方向上，从进风侧到回风侧，在垂直方向上，从底板到断裂带最上部，瓦斯浓度逐渐增大；上隅角瓦斯浓度由u型的13％T降到了U＋L型的0．6％左右，大大降低了上隅角瓦斯浓度，有效的解决了瓦斯超限的问题。

Numerical Simulation on Gas Flow Law in Mined-out Areas with Fully-mechanized Mining

The gas flow of mined-out areas under the U and U+L ventilation was simulated with standard two-equation model with Fluent software and its distribution was studied.The simulation results showed that the gas concentration increased gradually from natural accumulation area to steady compaction in the direction of path,from inlet side to return air side in the inclined direction,and from floor to top of fracture zone in the vertical direction.In addition,the gas concentration of upper corner decreased from 13...