Abstract
The ventilation tube was an important equipment in tunnels. Although the ventilation tube used in most coal mines was hard to ignite, it can be destroyed by fires. Based on numerical simulation methods, the influence of ventilation tube rupture locations on gas distribution has been investigated when fires happen. The results show that when the ventilation tube ruptured, the flow rate of the ventilation tube increased as the distance between the rupture location and the tunnel end increasing. In addition, when the distance increased to a certain value, “the second vortex” appears but its scale decreased as the fire intensity increasing. When at the same rupture location, the maximum gas concentration increased first and then decreased as the fire intensity increasing. When the ventilation tube ruptured, the coal gas distribution shows an “up-down” –“left-right”-“uniform” pattern from the tunnel end to the outlet, and whether the second vortex appeared or not is a critical factor on deciding the detailed gas distribution in the former part of the tunnel.
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