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Effect of combustion chamber design on mixture formation and emission in small DI diesel engines
Published October 23, 2001 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
This study proposed a new combustion chamber for small DI diesel engines having the characteristics of less adhering fuel, better mixture formation, and its optimum distribution. With this chamber the fuel spray distribution inside and outside the cavity was attempted photographically by changing the lip shape and the spray impinging position. Reduction in the fuel adhering to the cavity wall was attempted by introducing a small step on the cavity sidewall. The in-cylinder combustion and HC, NOx, and smoke emissions are also analyzed. It was concluded that a round lip and spray impingement just on the lip can reduce HC and smoke emissions by 30% and a small step at the cavity sidewall can reduce smoke emissions by 40% compared with a conventional cylindrical cavity.