抄録
Studies have been conducting on the suppressing effects of soluble fuel additives on soot emission from standard laboaratory spray flame and diesel engine combustion. In these studies, soot reduction was systematically examined by adjusting the amount of two kinds of additives. The one, composed of chain compound, is to increase cetane number and the other one, containing Ba, is to reduce the smoke in exhaust gases.
Flame temperature and soot concentration of the inside of steady spray flame were measured when using fuels mixed with each additive. These fuels with the additives were also used in a diesel engine to measure the exhaust smoke for comparison and investigation.
The results may be summarized as follows;
(1) On the effect of using the additive composed of chain compound, the maximum temperature point and soot formation zone in the steady spray flame are shifted to the upstream. The soot concentration is increased, however, the reaction of the soot decomosition becomes active, resulting in decrease the soot emission.
In the deisel engine, although ignition delay time is shortened and the diffusion combustion is promoted, which makes the soot emission increase.
(2) On the additive contained Ba, the soot exhausted from both of the spray flame and the diesel engine is decreased due to the decrease in soot formation and aggregation.
