Browse Publications Technical Papers 2009-01-0490
2009-04-20

Combustion Characteristics of Dual-Fuel Diesel Engine Using Emulsified Bio-Fuel for Pilot Ignition 2009-01-0490

Compression-ignition engines are more efficient than similar-sized spark-ignition engines because of the higher compression ratios and leaner operation. The emissions of soot and nitrogen oxides are the main hurdle in the wider exploitation of these engines. Dual-fuelling is a means favoured in solving the emission problem because high octane fuels can be used as the main fuel ignited by a smaller pilot injection of diesel fuel or another high cetane fuel. These dual-fuel engines produce lower particulate matter than diesel operation and lower nitrogen oxides than spark ignition engines, while retaining the desired compression-ignition engine efficiency. In the present investigation, tests were conducted using renewable and non-renewable fuels for pilot injection. The pilot fuels employed were conventional diesel fuel as baseline, neat and emulsified rapeseed methyl ester (RME) known as bio-diesel while natural gas was used as the main fuel. The emulsified pilot fuels were found to have extended ignition delay, compared to neat diesel and neat RME pilots, by a maximum of 10%, producing up to 30% lower peak combustion pressures. Emissions of nitrogen oxide were found to be significantly reduced (by about 40%) when emulsified fuels were used as pilot ignition at certain conditions. For the same conditions, unburnt hydrocarbons as well as carbon monoxide emissions were found to have increased (by about 60%). Carbon dioxide emissions were found to be relatively unchanged. It is noted that at high loads, all pilot fuels produced similar amounts of exhaust gas species.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Effect of Different Biodiesel Blends on Autoignition, Combustion, Performance and Engine-Out Emissions in a Single Cylinder HSDI Diesel Engine

2009-01-0489

View Details

TECHNICAL PAPER

Ozone-Assisted Combustion: Experimental Assessment of the Influence of Ozone in a Single-Cylinder Diesel Engine

2015-01-0787

View Details

TECHNICAL PAPER

Effects of GTL and HVO Blended Fuels on Combustion and Exhaust Emissions of a Common-Rail DI Diesel Technology

2014-01-2763

View Details

X