Effects of combustion chamber geometry on diesel combustion

Takeshi Saito*, Yasuhiro Daisho, Noboru Uchida, Nobuyukj Ikeya


研究成果: Conference contribution

41 被引用数 (Scopus)


A study has been made of an automotive direct-injection diesel engine in order to identify the effects of the combustion chamber geometry on combustion, with special emphasis focused on a re-entrant combustion chamber. Conventional combustion chambers and a re-entrant one were compared in terms of the combustion process, engine performance and NOx and smoke emissions. Heat transfer calculations and heat release analyses show that the re-entrant chamber tends to reduce ignition lag due to the higher temperatures of the wall on which injected fuel impinges. Analyses of turbulent flow characteristics in each chamber indicate that the re-entrant chamber enhances combustion because of the higher in-cylinder velocity accompanied by increased turbulence. Further, analyses of in-cylinder gas samples show lower soot levels in the re-entrant chamber. As a result, a good compromise can be achieved between fuel economy and exhaust emissions by retarding the fuel injection timing.

ホスト出版物のタイトルSAE Technical Papers
出版ステータスPublished - 1986
イベントInternational Off-Highway and Powerplant Congress and Exposition - Milwaukee, WI
継続期間: 1986 9月 81986 9月 11


OtherInternational Off-Highway and Powerplant Congress and Exposition
CityMilwaukee, WI

ASJC Scopus subject areas

  • 自動車工学
  • 安全性、リスク、信頼性、品質管理
  • 汚染
  • 産業および生産工学


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