直噴ディーゼル機関の燃焼特性と性能に及ぼす噴口角の影響

概要

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It is well known that the combustion chamber configuration of the direct injection compression ignition engine, in combination with the hole angle of the injection valve, exert a remarkable influence on mixture formation and the characteristic of exhaust emissions. However, although the trial and error method is often used, there has been extremely little use of this method for the research on the whole angle selection. We made a comparative study of the best hole angle to the chamber, based on different configurations of the combustion characteristic and engine performance, so that this research might contribute to the knowledge of chamber design. As the result, the best hole angle in the chamber cavity of dish type (d/D=0.50, d: cavity diameter, D: piton diameter) and reentrant bowl type (d/D-0.49) has both a large value of 120° compared with the theoretical values of 92°, 98° by the areal method and 80°, 80° by the cylindrical method. In the hole angle selection of the deep type, it is necessary to consider the influence of the squish flow based on the d/D.
久留米工業大学の論文
1999-12-20