Abstract
The well known technique to accelerate gas flames by introducing obstacles has been used for studying the properties of dust flames. To study in detail the mechanism of flame acceleration by means of obstacles some tests were carried out in an open 5 cm×5 cm square tube 1 meter long modified for visualization of the combustion process. The propagation of both dust and gas flame was studied. Analysis of the results show that flame acceleration in obstacle environments is due mainly to the effects of nonuniformity of the mean velocity across the tube. The explosion characteristics of gas and dust flames have been investigated in a closed tube 0.19 meters in diameter and 1.86 meters long, filled with obstacles. A comparative study of flame propagation velocity and, the maximum rate of pressure rise shows the similarity between flame propagation in a premixed cornstarch-air mixture and in a lean limit methane-air mixture. This similarity agrees with some conclusions obtained from the previous research, which indicated that the fundamental characteristics (such as the minimum quenching distance and the minimum ignition energy) between the above flames are comparable. It is inferred that there is some similarity in the processes controlling flame propagation in these flames.
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