| Summary: | In this study a
comprehensive study is carried out numerically on a single cylinder four-stroke
Diesel engine operating in homogenous charge compression ignition (HCCI) mode
of combustion for the effects of exhaust gas recirculation (EGR) temperature
and percentage on the combustion and emission characteristics. An advanced
version of ANSYS IC Engine FORTE coupled with highly efficient and detailed
pre-defined industry standard chemical kinetics CHEMKIN is used to solve the
chemical reaction mechanism and species thermodynamic data. The analysis was
carried out at three different EGR temperatures of 363K, 404K and 513K for 10%,
20% , 30%, 40% and 50% EGR each. The results predicted that the combustion
ignition timing is advanced by increasing the EGR temperature. The effect of
low EGR temperature is predominant at higher percentages of EGR. It was also
found that the CO and UHC levels nearly kept constant with an increase in EGR
temperature the NOx levels increase linearly with an increase in EGR
temperature. The HCCI combustion in diesel engine can be controlled by
adjusting the temperature and mass percentage of exhaust gas recirculation
while retaining lower NOx emissions and very little increase in CO and unburnt
hydrocarbons.
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