对下行通风时瓦斯涌出及下隅角瓦斯减少的原因进行论证，对上行风改为下行风应注意的问题进行了论证。
This paper discussed methane emission, the reasons for methane reduction in up corner, problems should be considered in the condition of change from normal ventilation into downriver ventilation.
在脉冲通风条件下，分析了回采工作面上隅角积聚区内瓦斯运移的物理过程，建立了上隅角积聚区瓦斯运移的动力学模型。
Under the condition of pulsed ventilation, the physical process of gas transport in the upper corner of mining face is analyzed, and the dynamic model of gas transport is set up.
在瓦斯涌出量一定的情况下，随着风速的增加，上隅角的范围呈减小趋势，且其内混合气体密度越小。
The range of upper corner and mix gas density is decreased as the face wind speed increased if gas emission is fixed.
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