TY  - JOUR
PY  - 2011//
TI  - The explosion overpressure field and flame propagation of methane/air and methane/coal dust/air mixtures
JO  - Safety science
A1  - Bai, Chunhua
A1  - Gong, Guangdong
A1  - Liu, Qingming
A1  - Chen, Yahong
A1  - Niu, Guotao
SP  - 1349
EP  - 1354
VL  - 49
IS  - 10
N2  - 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.<p />
LA  - en
SN  - 0925-7535
UR  - http://dx.doi.org/10.1016/j.ssci.2011.05.005
ID  - ref1
ER  -