Introduction:
Diesel engine is an internal combustion engine because the combustion of fuel takes place inside the engine cylinder. The running cost of diesel engine is low because lower cost of fuel is needed in diesel engine. The thermal efficiency of diesel engine is about 40% which is higher than SI engine. DI diesel engine is more preferable than IDI diesel engine because in DI diesel engine the fuel consumption is 15-20% lowers than IDI diesel engine [1].Besides the combustion phenomenon of DI diesel engine is easier than IDI diesel engine because in DI diesel engine there is a single combustion chamber. As for the fuels in diesel engines, research has been conducted to clarify the effects of fuel properties on diesel combustion and exhaust emissions.