Browse Publications Technical Papers 2011-01-0628
2011-04-12

Use of Renewable Oxygenated Fuels in Order to Reduce Particle Emissions from a GDI High Performance Engine 2011-01-0628

The use of oxygenated and renewable fuels is nowadays a widespread means to reduce regulated pollutant emissions produced by internal combustion engines, as well as to reduce the greenhouse impact of transportation. Besides PM, NOx and HC emissions, also the size distribution of particles emitted at the engine exhaust represent meaningful information, considering its adverse effects on the environment and human health. In this work, the results of a comprehensive investigation on the combustion characteristics and the exhaust emissions of a GDI high performance engine, fuelled with pure bio-ethanol and European gasoline, are shown. The engine is a 4-cylinder, 4-stroke, 1750 cm₃ displacement, and turbocharged. The engine was operated at different speed/load conditions and two fuel injection strategies were investigated: homogeneous charge mode and stratified charge mode. The particle size distribution at the engine exhaust was measured in the range 5-1000 nm using a differential mobility spectrometer. Simultaneously, the air-fuel mixing and the combustion process inside the cylinder were followed by means of high-speed imaging in the UV-visible. To this aim, the last cylinder was optically accessible through a sapphire window (5 mm wide) in the engine head. The particles size distributions measured at the engine exhaust for both gasoline and bio-ethanol show similar trends, suggesting a common route for the particles formation. For bio-ethanol the accumulation mode is shifted towards smaller sizes, which could be ascribed to the chemical and physical properties of the fuel, as observed by optical investigation of the fuel injection and combustion process. On the other hand, an increase of particles number concentration for stratified charge operating mode was observed for both fuels, due to the poorer air fuel mixing and the diffusive combustion of the fuel films deposited on the piston and cylinder wall.

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

On the Cyclic Variability and Sources of Unburned Hydrocarbon Emissions in Low Temperature Diesel Combustion Systems

2007-01-1837

View Details

TECHNICAL PAPER

Fuel Injection Strategy for Clean Diesel Engine Using Ethanol Blended Diesel Fuel

2005-01-1725

View Details

TECHNICAL PAPER

Total In-Cylinder Sampling Experiment on Emission Formation Processes in a D.I. Diesel Engine

902062

View Details

X