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Generation of Hydrocarbon Emissions From a Direct Injection Diesel Engine
Published September 26, 1995 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
The generation of unburned hydrocarbon emissions due to physical effects was studied using KIVA-II. The results showed that exhaust hydrocarbons increase due to poor mixing of fuel with air during the ignition delay period at the low swirl case, and bulk quenching due to high mixing rate and high heat loss to the wall during the combustion and expansion processes at the high swirl case. The re-entrant combustion chamber is advantageous for unburned hydrocarbon emissions in the case of retarded injection timing, but this modification produces excessive mixing and bulk quenching for advanced timing and as a consequence higher unburned hydrocarbon emissions.