Experimental study of high concentrations of coal mine methane behavior in downward ventilated tilted roadways
作者： Kai Wang , Zeqi Wu , Aitao Zhou , Yifeng Jiang , Shuo Feng
DOI: 10.1016/J.JWEIA.2016.09.012
关键词: Methane 、 Airflow 、 Flow (psychology) 、 Geotechnical engineering 、 Density difference 、 Windage 、 Coal mine methane 、 Environmental science 、 Archimedes number 、 Wind speed
摘要: Abstract The movement and distribution of methane in coalmine roadways are major issues relating to safety. Once high concentrations accumulate downward ventilated tilted roadways, the can be very special. A 1/50 experimental model was constructed for study on behavior parallel roadways. This experiment measured gas upper lower parts accumulating roadway wind speeds both its results indicate that draft pressure (the additional natural due density difference air when roadways) could lead airflow reversion a roadway; may flow with reversed into roadway. flows generate new pressure, which would oscillate under certain conditions. According different windage, larger windage branch ensure relatively stable airflow, smooth discharge process. Through analysis by oscillation theory Archimedes number, it is concluded affects pressure-caused disorder two aspects: (1) deceases amplitude (2) decreases flown branch, which, turn, critical velocity effect proved numerical simulation Jiulishan Mine at end this paper.
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