微速空気流中におけるエマルション液滴列の燃拡がり

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An experimental study has been made of the behavior of flame spread along linear arrays of emulsion droplets suspended on quartz fibers in slow air flow. Emulsions consisting of base fuel, water and a small amount of surfactant were tested. Two types of surfactants were used for changing the state of the emulsions; one was used for producing a water-in-oil emulsion and another for an oil-in-water emulsion. The base fuel was n-dodecane. The effects of the emulsified state, initial water content, droplet spacing in the array and forced air flow velocity on the flame spread were examined. Two modes were observed for the flame spread. The mode changed at certain values of the droplet spacing and the flame spread velocity showed a peak around the mode transition. The flame spread velocity increased with the air co-flow velocity. The oil-in-water emulsion showed slightly higher flame spread velocities than the water-in-oil emulsion in the opposing forced air flow or without forced flow. The flame spread velocities for the water-in-oil emulsions turned to exceed those for the oil-in-water emulsions in the air co-flow. The droplet spacing at the peak velocity of the flame spread showed an increasing trend with the air co-flow velocity. The flame spread velocity decreased with increasing the initial water content. Reduction of the velocity was comparable to that of the water content. The difference in the velocity between the emulsified states was reduced with higher water content. The oil-in-water emulsion reached the spread limit at smaller water content without forced flow.

微速空気流中におけるエマルション液滴列の燃拡がり

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