回采工作面下行通风在我国许多地方的不同条件下均有使用。
The stope downward ventilation technique has been used under different conditions in many places of our country.
但下行通风在发生火灾时往往会引起风流紊乱，容易造成风流逆转。
However, when the fire happens, the downward ventilation can often cause the air disorder and air inversion easily.
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.
实验结果表明：下行通风角联分支风流的逆转可以归结为烟流和风流异向分层流动的量变过程和风向突变的质变过程。
Results obtained show that reversal procedure of diagonal branch contains two stages, one is stratified flow of smoke and airflow toward different directions, which is a quantitative change stage.
实验结果表明：下行通风角联分支风流的逆转可以归结为烟流和风流异向分层流动的量变过程和风向突变的质变过程。
Results obtained show that reversal procedure of diagonal branch contains two stages, one is stratified flow of smoke and airflow toward different directions, which is a quantitative change stage.
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