کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
589828 | 878721 | 2011 | 6 صفحه PDF | دانلود رایگان |
The explosion of the methane/air mixture and the methane/coal dust/air mixture under 40 J center spark ignition condition was experimentally studied in a large-scale system of 10 m3 vessel. Five pressure sensors were arranged in space with different distances from the ignition point. A high-speed camera system was used to record the growth of the flame. The maximum overpressure of the methane/air mixture appeared at 0.75 m away from the ignition point; the thickness of the flame was about 10 mm and the propagation speed of the flame fluctuated around 2.5 m/s with the methane concentration of 9.5%. The maximum overpressure of the methane/coal dust/air mixture appeared at 0.5 m. The flame had a structure of three concentric zones from outside were the red zone, the yellow illuminating zone and the bright white illuminating zone respectively; the thickness and the propagation speed of the flame increased gradually, the thickness of red zone and yellow illuminating zone reached 3.5 cm and 1 cm, the speed reached 9.2 m/s at 28 ms.
► The explosion of the methane/air mixture and the methane/coal dust/air mixture was experimentally studied in a 10 m3 vessel.
► Five pressure sensors were arranged in space with different distances from the ignition point.
► The peak overpressure of the methane/air and the methane/coal dust/air explosions appeared at 0.75 m and 0.5m from the ignition point.
► A high-speed camera system was used to record the growth of the flame.
► The structures and flame parameters of methane/air flame and the methane/coal dust/air flame were compared and studied.
Journal: Safety Science - Volume 49, Issue 10, December 2011, Pages 1349–1354