高温雰囲気中における混合燃料の単一液滴の燃焼

概要

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Marine fuel oil is a mixture of cutter stock oil and base oil. The combustion processes of suspended single droplets of blended fuels were experimentally observed in air at high ambient temperature with regard to the effects of the fuel mixture ratio, initial droplet diameter, and ambient air temperature on the ignition delay and burning time. Stationary fuel droplets suspended on a fine quartz fiber were put into a furnace which moves on horizontal rails. For the droplets of the cutter stock oil, the ignition delay is roughly constant while the initial droplet diameter changes. On the other hand, for the droplets of the base oil, the delay increases in proportion to the initial diameter. For the droplets of both fuels, the burning time increases in proportion to the square of the diameter. The droplets of the mixture at low cutter concentration are ignited by the vapor of the base oil at low ambient temperature. In this case, the ignition delay increases with the increase in cutter concentration, while the burning time decreases. On the contrary, when the droplet is ignited by the cutter, the ignition delay decreases with the increase in cutter concentration. The burning time increases with the increase of cutter concentration up to 30% and is roughly constant for concentrations above 30%. For all these droplets, the ignition delay decreased with the increase of ambient temperature.
1998-01-14