Combustion characteristics of a dual fuel diesel engine with biodiesel as ignition fuels

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This study investigated the influence of operating variables on engine performance, combustion characteristics, and emissions with a dual fuel diesel engine powered by natural gas (CNG) supplied from the intake-pipe as the main fuel and an ignition fuel sprayed into the combustion chamber. The results showed that: (1) at high loads the dual operation requires ignition fuels with cetane numbers higher than 45; (2) when DME (di-methyl ether) a compound with a high reaction rate is premixed with the CNG, the pattern of the combustion is very different for different CNG supply ratios; and (3) remarkable improvements in the trade-off relation between the NOx and smoke emissions are possible when N2 or CO2 gas dilution of the intake air was employed with dual fuel diesel combustion.