DME噴流拡散火炎におけるすす生成特性

抄録

Experimental study of soot formation in DME jet diffusion flame was performed under various surrounding temperature and oxygen conditions. Amount of soot in the flame was measured by the transmitted light attenuation method, and was compared with that of the methane diffusion flame under the same surrounding conditions. The results showed that maximum soot concentration appeared in a given temperature and oxygen concentration, i. e. more than 1000K and O₂=10-13%, while DME is known as a soot free fuel. The oxygen concentration to give maximum soot concentration shifts to lower oxygen concentration with increase in surrounding air temperature. The range of surrounding oxygen concentration for soot formation with DME shifts toward lower oxygen concentration in comparison with methane combustion. These facts are elucidated by the appearance of maximum soot concentration at a balanced condition of soot formation and soot oxidation, which strongly depends on the surrounding temperature and type of fuel.