ゲル化炭化水素燃料の液滴燃焼
1980 年 59 巻 12 号 p. 997-1005
詳細
1980 年 59 巻 12 号 p. 997-1005
Burning characteristics of a single droplet of gelled-pentane and -kerosene (80-95vol.%, oil in water type) were studied experimentally.The results show that“D2 law”which has been used to the droplet burning of liquid fuels, can be also applied for these cases.The evaporation constants and the flame diameters for gelled kerosene were smaller than those of pure kerosene, and these values decreased with the lowering of fuel content in the gel.
In the droplet combustion of gelled fuel, a special behavior called“splash”was observed at the last stage of stable burning.It was confirmed through a few additional experiments that this phenomenon was caused by the rapid evaporation of residual water in the droplet.Delayed evaporation of water during the combustion of gelled fuel droplet was also supported from the comparison between theoretical calculation and experimental value of evaporation constant.
Moreover, a similar experimental procedure was applied to the gelled kerosene in double and triple droplets systems.The results show that“D2 law”holds true even under these condi-tion, and the maximum evaporation constants obtain from the droplet interval where the enve-lope flame makes into just contact with an adjacent droplet flame.Splash phenomenon was also found for these conditions, but it occurs earier than the case of single droplet.This result seems to be originated in the increase of heat flux from flame to droplet.
