Effects of combustion chamber geometry on diesel combustion

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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

41 Citations (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.

Original languageEnglish
Title of host publicationSAE Technical Papers
Publication statusPublished - 1986
EventInternational Off-Highway and Powerplant Congress and Exposition - Milwaukee, WI
Duration: 1986 Sept 81986 Sept 11


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

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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