Effects of Combustion Chamber Geometry on Diesel Combustion

861186

09/01/1986

Event
1986 SAE International Off-Highway and Powerplant Congress and Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/861186
Pages
16
Citation
Saito, T., Daisho, Y., Uchida, N., and Ikeya, N., "Effects of Combustion Chamber Geometry on Diesel Combustion," SAE Technical Paper 861186, 1986, https://doi.org/10.4271/861186.
Additional Details
Publisher
Published
Sep 1, 1986
Product Code
861186
Content Type
Technical Paper
Language
English