Chemical kinetic modeling study of the effects of oxygenated hydrocarbons on soot emissions from diesel engines.

A detailed chemical kinetic modeling approach is used to examine the phenomenon of suppression of sooting in diesel engines by the addition of oxygenated hydrocarbon species to the fuel. This suppression, which has been observed experimentally for a few years, is explained kinetically as a reduction in concentrations of soot precursors present in the hot products of a fuel-rich diesel ignition zone when oxygenates are included. The kinetic model is also used to show how different oxygenates, ester structures in particular, can have different soot-suppression efficiencies due to differences in the molecular structure of the oxygenated species.

[1]  Dimitrios T. Hountalas,et al.  Experimental Investigation to Specify the Effect of Oxygenated Additive Content and Type on DI Diesel Engine Performance and Emissions , 2004 .

[2]  Dennis L. Siebers,et al.  Effects of Oxygenates on Soot Processes in DI Diesel Engines: Experiments and Numerical Simulations , 2003 .

[3]  Thomas A. Litzinger,et al.  Effects of Structure and Boiling Point of Oxygenated Blending Compounds in Reducing Diesel Emissions , 1999 .

[4]  Dennis L. Siebers,et al.  Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions , 2001 .

[5]  Kazuhiro Akihama,et al.  Effect of the hydrocarbon molecular structure in diesel fuel on the in-cylinder soot formation and exhaust emissions , 2005 .

[6]  Takayuki Ito,et al.  Soot Kinetic Modeling and Empirical Validation on Smokeless Diesel Combustion with Oxygenated Fuels , 2003 .

[7]  H. Wagner.  Soot Formation — An Overview , 1981 .

[8]  Charles J. Mueller,et al.  Effects of Oxygenated Compounds on Combustion and Soot Evolution in a DI Diesel Engine:Broadband Natural Luminosity Imaging , 2002 .

[9]  John E. Dec,et al.  Effects of Fuel Parameters and Diffusion Flame Lift-Off on Soot Formation in a Heavy-Duty DI Diesel Engine , 2002 .

[10]  Charles J. Mueller,et al.  Using Carbon-14 Isotope Tracing to Investigate Molecular Structure Effects of the Oxygenate Dibutyl Maleate on Soot Emissions from a DI Diesel Engine , 2004 .

[11]  J. Dec.  A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging* , 1997 .

[12]  Thomas A. Litzinger,et al.  Quantitative 2-D Fuel Vapor Concentration Imaging in a Firing D.I. Diesel Engine Using Planar Laser-Induced Rayleigh Scattering , 1994 .

[13]  Pierre-Alexandre Glaude,et al.  Detailed Chemical Kinetic Modeling of Diesel Combustion with Oxygenated Fuels , 2001 .

[14]  J. Naber,et al.  Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays , 1996 .

[15]  Noboru Miyamoto,et al.  Smokeless, Low NOx, High Thermal Efficiency, and Low Noise Diesel Combustion with Oxygenated Agents as Main Fuel , 1998 .

[16]  Christoph Espey,et al.  Soot and Fuel Distributions in a D.I. Diesel Engine via 2-D Imaging , 1992 .

[17]  Christoph Espey,et al.  Ignition and early soot formation in a DI diesel engine using multiple 2-D imaging diagnostics , 1995 .

[18]  John E. Dec,et al.  Soot Distribution in a D.I. Diesel Engine Using 2-D Imaging of Laser-induced Incandescence, Elastic Scattering, and Flame Luminosity , 1992 .