本研究在玻璃槽中用细管注水和在充满水的玻璃槽中用细管送气观察流动情况 ,同时考虑了瓦斯气泡在空气中有趋顶 (上升 )和扩散的特性 ,给出了有瓦斯气泡逸出的煤矿用风筒送风情况下的流动图形 ,得出煤矿巷道顶部朝采煤面的走向是个重要因素 ,向下倾斜是安全的。向上倾斜不安全 ,可形成 5 %～ 15 %瓦斯气—空气的可爆炸混气区。用风筒向采煤面附近送风不能消除这种不安全性。这是煤矿瓦斯爆炸的主要原因 In this study, we observed the flow in a glass tank with thin tube and capillary tube in a water-filled glass tank, taking into account the gas bubble in the air to the top (rise) and diffusion characteristics, given the gas Bubble escaping coal mine with air flow case under the flow pattern, come to the coal mine roadway toward the top of the coal face is an important factor, the downward tilt is safe. Unsafe upward tilt, can form 5% ~ 15% gas - air blast area can be mixed. Air blowing near the coal face with a blower can not eliminate this unsafeness. This is the main reason for coal mine gas explosion