Browse Publications Technical Papers 2008-01-0027
2008-04-14

Extinction and Chemiluminescence Measurements of HCCI Mode in Diesel Engine Operating with Late Injection 2008-01-0027

Nowadays HCCI combustion process is revealing the most useful technique for reducing pollutant emission from internal combustion engines. In the present paper, HCCI combustion was realized by means of single late injection at high pressure and heavy EGR, up to 50%. A transparent Direct Injection (DI) diesel engine equipped with high pressure Common Rail (CR) injection system was used. The engine was fed with commercial diesel fuel and ran in continuous mode.
Digital imaging and spectroscopic techniques, with high temporal and spatial resolution, were applied to study the low temperature combustion process. Injection and combustion phases were analysed by digital imaging. Mixing process, autoignition and pollutants formation were investigated by Broadband Ultraviolet - Visible Extinction Spectroscopy (BUVES) and flame emission measurements. Radicals and species such as OH, CH and CO were detected in the combustion chamber. They are of interest in order to study the chemical kinetics of low temperature combustion process. Moreover, fuel distribution and oxidation were studied. Finally, the injection pressure effect on the development of low temperature combustion was analysed.
Liquid and vapour phase of fuel, injected around the top dead centre, were analysed. Extinction due to liquid diesel fuel was observed when the liquid jet reached the bowl rim. Vapour fuel was detected 2° ca after the start of injection and liquid one disappeared. Aromatic compounds due to fuel decomposition were identified. During combustion, bright spots due to non homogeneous charge were detected. They were the source of very low amount of soot detected at the exhaust pipe. Finally, several radicals like HCO, CH and OH were detected. In particular, OH was strongly evident during the whole premixed combustion and dominated the process also beyond the end of the premixed rate of heat release.

SAE MOBILUS

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

Access SAE MOBILUS »

Preview Document Add to Cart
Members save up to 16% 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

Experimental Study on Improvement of Diesel Combustion and Emissions Using Flash Boiling Injection

2010-01-0341

View Details

TECHNICAL PAPER

An Investigation of Ignition and Heat Release Characteristics in a Diesel Engine Using an Interactive Flamelet Model

2003-01-1062

View Details

TECHNICAL PAPER

An Investigation of Injection Rate Controlled Heat Release of Low Cetane Fuels in a Direct Injected Diesel Engine

902061

View Details

X