Investigation on the Emission, Performance and Combustion Characteristics of Diesel Engine Fuelled with Biodiesel-Diesel Blends
Tolgahan Kaya Osman Kutlar Ozgur O. Taskiran
AbstractIn this experimental study, the effects of biodiesel on emission, performance and combustion parameters were investigated by performing full load experiments on a passenger car with diesel engine. A 1.5 liter diesel engine was tested from 2000 rpm to 4000 rpm with 5 different biodiesel-to-diesel blends and pure diesel. Engine sensors, wheel power, exhaust emissions, and in-cylinder pressure data were acquired to quantify the effects of combustion characteristics on emission and power stemming from biodiesel addition. Heat release rate, start of combustion, ignition delay duration and burn duration for all engine speeds were calculated from measured in-cylinder pressure data. The calculations revealed that biodiesels lead to earlier start of combustion, shorter ignition delay and burn duration. Higher oxygen content of biodiesel improves ignition and combustion quality and lowers HC and CO emissions, and exhaust gas temperature. However, steep in-cylinder pressure and heat release increase of biodiesel cause higher NOx emissions. Although biodiesel enables cleaner combustion than diesel, fuel consumption increases with biodiesel addition due to its lower heat release rate as a result of its lower gross calorific value compared to diesel.