<論文>エマルジョン燃料滴の燃焼

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Single droplet combustion of oil-in-water (O/W), water-in-oil (W/O) emulsified fuels and mixtures of emulsified heavier oils and coal powders (COM) has been studied in a quiescent air atmosphere, with the aid of high speed motion pictures. Singular phenomena, microexplosion and disintegration occurring at the later stage of burning, with which better atomization and enhancement of apparent burning rate may be attained, were discussed on their mechanisms. The data of differential scanning calorimetry, differential thermal analysis and thermogravimetry for emulsified fuels suggest the temperature of microexplosion occurrence. No microexplosion was observed with emulsified n-heptane and n-octane whereas it was observed with emulsified JP-4, kerosene, gas oil and heavy fuel oil. Based on surface chemistry consideration and experimental observations, it is concluded that a critical condition for realizing microexplosion is the boiling point of hydrocarbon components exceeding that of water. A comparison of the combustion aspects among O/W, W/O emulsion fuels and COM is made.
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