Browse Publications Technical Papers 2013-01-2667

Soot Formation of Different Diesel-Fuels Investigated by Chemical Luminescence and Laser Induced Incandescence 2013-01-2667

Differences in thermo-physical parameters of fuels have high impact on the ignition, combustion and emission. Pure rapeseed FAME and diesel fuel with a cetane number of 60 have been compared to reference fuel. In an optical accessible vessel the fuels have been injected in order to investigate the spray, the ignition and soot formation.
The high cetane number fuel showed similar behavior in spray phase to the reference fuel but the FAME fuel is more present at all operating points due to low volatile fuel components.
The ignition and combustion process was investigated via chemical luminescence (CL) and laser induced incandescence (LII). In engine investigations a reduced ignition delay is detected in case of high cetane-number. The more sensitive optical techniques show differences in the combustion process. The ignition behavior of the reference fuel and the increased cetane number fuel were similar until the cetane increaser of the high cetane fuel came into effect. The FAME showed a shortened ignition delay but was found to be slower in combustion propagation.
For the LII investigation a Nd:YAG pulsed laser with a wavelength of 532 nm was used. The light sheet excited the soot particles up to temperatures where the black body radiation is shifted towards the UV-spectra. The soot formation of the reference fuel is equal to the soot formation of the high cetane number fuel until the cetane increaser affected the flame and increased soot production. The soot production of the FAME is advanced in time but overall significantly lower.


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


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:

Optical Diagnostic Combustion Comparisons of Pump Diesel with Bio-Derived Diesel Blends in an Optical DI Diesel Engine


View Details


Dual-Laser LIDELS: An Optical Diagnostic for Time-Resolved Volatile Fraction Measurements of Diesel Particulate Emissions


View Details


Diffuse Back-Illuminated Extinction Imaging of Soot: Effects of Beam Steering and Flame Luminosity


View Details