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Effects of Fuel Parameters and Diffusion Flame Lift-Off on Soot Formation in a Heavy-Duty DI Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 04, 2002 by SAE International in United States
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To better understand the factors affecting soot formation in diesel engines, in-cylinder soot and diffusion flame lift-off were measured in a heavy-duty, direct-injection diesel engine. Measurements were obtained at two operating conditions using two commercial diesel fuels and a range of oxygenated paraffinic fuel blends. A line-of-sight laser extinction diagnostic was improved and employed to measure the relative soot concentration within the jet (“jet-soot”) and the rates of soot-wall deposition on the piston bowl-rim. An OH chemiluminescence imaging technique was developed to determine the location of the diffusion flame and to measure the lift-off lengths of the diffusion flame to estimate the amount of oxygen entrainment in the diesel jets.
Both the jet-soot and the rate of soot-wall deposition were found to decrease with increasing fuel oxygen-to-carbon ratio (O/C) over a wide range of O/C. Good agreement between soot-wall deposition and jet-soot measurements indicates that using the soot-wall deposition diagnostic to indirectly measure jet-soot is valid. This is especially useful when the jet-soot is too optically thick to be measured directly. OH chemiluminescence imaging indicated little differences in the flame lift-off and corresponding oxygen entrainment between fuels. Commercial diesel fuels displayed higher sooting tendencies than the zero-oxygen-content paraffinic fuel blend. Since the estimated oxygen entrainment rates were similar, differences in soot formation are most likely due to the effects of fuel chemical structure. A linear extrapolation of the soot-wall deposition data for the oxygenated, paraffinic fuels predicts that zero soot formation may be achieved when the fuel atomic O/C exceeds 0.4.
CitationMusculus, M., Dec, J., and Tree, D., "Effects of Fuel Parameters and Diffusion Flame Lift-Off on Soot Formation in a Heavy-Duty DI Diesel Engine," SAE Technical Paper 2002-01-0889, 2002, https://doi.org/10.4271/2002-01-0889.
Compression Ignition Combustion and In-Cylinder Diesel Particulates and Nox Control
Number: SP-1698 ; Published: 2002-03-04
Number: SP-1698 ; Published: 2002-03-04
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