小形直接噴射式ディーゼル機関の始動性と青・白煙に関する研究 : 第3報,リップ形燃焼室の影響

抄録

The previous reports have been determined that the problems of cold startability and blue and white smoke (cold smoke) in a small direct injection diesel engine are improved by the shallow type combustion chamber and weaker swirl ratio. In this report, the lip type combustion chamber, which provides good performance and good economy, was tested in order to know the influence on the cold startability and the cold smoke of various lip diameters, lip thicknesses and shapes. The following results were obtained. There is an optimum lip diameter for cold startability. A thick lip is inferior to a thinner lip in so far as cold startability and the cold smoke is concerned. The lip shape effects cold startability, and a round shape, which diminishes the contraction flow, shows a good result. Cold startability and the cold smoke deteriorate with the swirl strength in the lip type as well as the bowl and square cavity combustion chambers.