Observation of Micro-Explosions in Spray Flames of Light Oil-Water Emulsions.
Observation of Micro-Explosions in Spray Flames of Light Oil-Water Emulsions.
复制标题
轻质油水乳液喷雾火焰中微爆炸的观察。
DOI：
10.1299/kikaib.66.646_1544
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
M. Muraoka
中科院分区：
文献类型：
--
作者：
Y. Mizutani;M. Fuchihata;Y. Matsuoka;M. Muraoka
成功地观测到了乳化燃料液滴的微爆炸，并估算了油包水型轻质油水乳状液敞口喷雾火焰中局部爆炸发生频率的分布规律。采用深切式刀口纹影光学系统进行背光照明，并用带像增强器的高速摄像机记录每个液滴的微爆炸过程。几乎所有已观察到的单个悬浮乳化液滴的微爆炸模式也都发生在目前的喷雾火焰中。随着乳状液中含水率的增加或搅拌时间的延长，微爆发生的频率增加。这一频率似乎从喷油嘴上方90 mm处突然增加。然而，由于液滴密度过大导致观测困难，微爆炸极有可能是从上游更靠前的地方开始的，因为加水的影响在上游最明显。
The micro-explosion of emulsified fuel droplets was successfully observed, and the distribution pattern of local frequency of explosion occurrence was estimated in open spray flames of water-in-oil type light oil-water emulsion formed using a twin-fluid (air) atomizer with a ring pilot burner. A schlieren optical system with a deep-cut type knife-edge was adopted for back light illumination, and the process of micro-explosion of each droplet was recorded by a high-speed video camera with an image intensifier. Almost all the patterns of micro-explosion having been observed for single suspended emulsion drops were seen occurring also in the present spray flames. The frequency of micro-explosion occurrence increased as the water fraction in the emulsion was raised or agitation period was elongated. It appears that this frequency increases suddenly from 90 mm above the fuel injection nozzle. It is highly probable, however, that micro-explosion starts somewhere more upstream without being observed due to the difficulty in observation resulted from the excessive density of droplets, since the effect of water addition is most prominent in the upstream region.