Abstract
Combustion experiments of fuel droplet array were performed to investigate growth mechanism of group combustion of fuel droplets. The purpose of this research is to examine the effect of gas-phase equivalence ratio on the flame spread. Ten fuel droplets were simultaneously generated with very thin glass tubes and suspended in a straight line at the crossing points of X-shaped suspenders which were fixed at equal intervals. Fuel vapor-air mixture was filled in a combustion chamber. Behavior of flame spread along a fuel droplet array was observed and flame spread speed was measured for various droplet intervals and gas phase equivalence ratio. It was found that the flame spread speed increases with the increase in the gas-phase equivalence ratio. Flame spread speed increases up to droplet interval of 1.8mm and then decreases. In the case of 0.7 in the gas-phase equivalence ratio and 1.8mm in the droplet interval, a gas-phase propagating flame, which preceded a spreading flame along droplet array, appeared at the final stage of flame spread.
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