311 高温金属面上での乳化燃料の蒸発, 燃焼, ミクロ爆発

概要

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Experimental study was carried out to reveal evaporation characteristics of emulsion droplet on a hot surface. Detail measurements of onset of micro-explosion and temporal variation of droplet temperature were made for three base fuels at surface temperature of 700 K. The fuel in water emulsions consisting base fuel and water, doped with small amount of surfactant, were tested after degasification. Water coalescence occurred and formation of transparent droplets which surrounded smaller single opaque droplets were observed as in the case for suspended droplet combustion. The waiting times for the onset of micro-explosion were correlated with the Weibull distribution curves and those shape parameter twice of unity. The waiting time became shorter with higher boiling point of base fuel. The droplet thermometry showed that microexplosion occurred during droplet heat-up resulting in the above-mentioned shape parameter.
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