微小重力下乳化燃料液滴燃焼時における液相の挙動

概要

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An experimental study has been carried out to obtain the detailed information needed for the deep understanding of the combustion process of an emulsified fuel droplet under microgravity. The experiments were conducted by using the drop shaft of JAMIC (Japan Microgravity Center) at Hokkaido. Photographic observation and temperature measurement were made of the emulsified fuel droplet burning in quiescent gaseous environment at the atmospheric pressure. The primary attention was toward the transport processes in the liquid phase and the time histories of liquid temperature and the amount of water in the liquid phase during the period of time prior to the microexplosion. The results showed that the agglomeration and separation of the water and the base fuel layers occurred with the lapse of time. The increase in the temperature of the emulsified fuel resulted in the formation of a single water droplet enveloped by a shell of base fuel prior to the microexplosion. After the phase separation, selective evaporation of the base fuel would occur and the volume of base fuel decreased while the water volume did not change. The effects of the water volume on the onset rate of microexplosion were also revealed.
一般社団法人日本機械学会の論文
2000-05-25