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A Study of Soot Formation Processes in a Dual Fueled Compression Ignition Engine
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Abstract
The characteristics of exhausted smoke of a methanol DI diesel engine which is ignited by diesel fuel are investigated to clarify the soot formation process. At this engine, very little smoke is exhausted when diesel fuel is kept below a certain amount, so soot and smoke emitting characteristics are studied under the various diesel fuel amounts.
By analyzing microstructure of soot, it is found that the soot emitted from the methanol diesel engine is composed of inner core and outer shell, similar to that of the conventional diesel engines. From more detailed qualitative analysis, the calcium percentage from the lubricating oil in outer shell is much higher than that of the conventional diesel engines. In consideration of soot characteristics, spray structure and combustion characteristics, the soot formation process of the methanol diesel engine was clarified. Furthermore, it has become apparent that, in order to reduce soot in the cylinder of engine, oxidizing of the inner core of soot, before the complete soot is formed, is important.
The exhausted emissions from the diesel engines for vehicles are becoming one of the urgent subjects to be solved. Especially, smokeless diesel is strongly demanded for the heavy traffic conditions. To reduce smoke drastically, the basic researches on the soot emitted from the diesel engines had been carried out and reported about the soot formation process. (1), (2) and (3) However, most of investigations are discussed from the view points of physicochemical reactions, and few investigated by soot structure analysis. On the other hand, it is known that the major part of soot is an insoluble substance with high carbon density and its shape is very refined. Therefore it is considered that the structure analysis of carbon solid refined particle contributes to the clarification of soot formation and growth process. From this point of view, the investigation by electron microscope, which enables nano order atomic structure and element analysis, is essential. As a basic research to reduce soot emitted from the diesel engines, authors have investigated the soot from direct and indirect injection diesel engines. (4) (5) In these investigations, soot formation and growth process were discussed in relation of combustion condition and physicochemical properties of the soot.
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Kawaguchi, A., Sato, Y., Yanagihara, H., and Ishiguro, T., "A Study of Soot Formation Processes in a Dual Fueled Compression Ignition Engine," SAE Technical Paper 922304, 1992, https://doi.org/10.4271/922304.Also In
References
- Kittelson, D.B. et al. “Particle Concentrations in a diesel cylinder. comparison of theory and experiment” SAE Paper- 861569 1986
- Rawlins, W.T. et al. “Soot initiation in diesel environments” 1984
- Yoshihara, Y. et al. “Homogeneous Nucleation Theory for Soot Formation” JSMEInt. J Ser 2 32 2 273 280 1989
- Ishiguro, T. et al. “Characterization of Soot Emitted from Direct Injection Diesel Engine” JSAE Review 22 1 Jan. 1991 6 0 6 5
- Ishiguro, T. et al. “Characterization of Soot Emitted from IDI Diesel Engine” JSAE Review 22 4 Oct. 1991 59 63
- Yanagihara, H. et al. “A New Approach to Methanol Combustion in Direct Injection Diesel Engine” 8th Int. Symp. on Alcohol Fuels 1988 619
- Iijima, S. “The 60-Carbon Cluster Has Been Revealed!” J.Phys.Chem. 1987 91 3466 3467
- Akhter, M.S. et al. “The Structure of Hexane Soot 1: Spectroscopic Studies” appl. Spectrosc. 39 1 143 153 1985
- Graham, S.C. et al. “The Formation and Coagulation of Soot Aerosols Generated by the Pyrolysis of Aromatic Hydrocarbons” Proc. R.Soc.Lond. A344 259 285 1975
- Aoyagi, Y. et al. “A Gas Sampling Study on the Formation Processes of Soot and NO in a DI Diesel Engine” SAE Paper- 800254 89 1980
- Haynes, B.S. et al. “Soot Formation” Prog. Energy Conbust.Sci. 7 229 273 1981
- Matsui, Y. et al. “Formation and Oxidation Processes of Soot Particles in a DI Diesel Engine-An Experimental Study Via the Two-Color Method” SAE Paper- 820464 91 1982