This content is not included in your SAE MOBILUS subscription, or you are not logged in.
A Computational Investigation of Premixed Lean Diesel Combustion - Characteristics of Fuel-Air Mixture Formation, Combustion and Emissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1999 by SAE International in United States
Annotation ability available
The effects of fuel injection timing on fuel-air mixture formation, combustion and emissions for a PREmixed lean DIesel Combustion (PREDIC) engine has been studied numerically by the KIVA II modeling package. The software was modified with an improved autoignition and combustion submodel, which describes the formation of combustible or ignitable fuel-air mixtures by turbulent mixing, and describes four chemical reactions, including low-temperature oxidation. The results indicate that the present computational model reproduces major features of two-stage autoignition and experimentally observed trends in NO and unburned fuel emissions. The relationships among in-cylinder distributions of fuel sprays, fuel-air equivalence ratio, temperature and mass fractions of NO and unburned fuel were demonstrated by graphically imaged results. A method of fuel-air mixture characterization has been introduced and used to analyze the numerical results. This method defines the average value of physical quantities in the fuel-air mixture, and the size or volume of the fuel-air mixture region. The results obtained by this characterization method indicate that the advantage of extremely early fuel injection for lean mixture formation consists of not only a longer mixture formation period, but also the possibility of greater mixture penetration.
CitationMiyamoto, T., Harada, A., Sasaki, S., Akagawa, H. et al., "A Computational Investigation of Premixed Lean Diesel Combustion - Characteristics of Fuel-Air Mixture Formation, Combustion and Emissions," SAE Technical Paper 1999-01-0229, 1999, https://doi.org/10.4271/1999-01-0229.
- Takeda, Y. Nakagome, K. Niimura, K. “Emission Characteristics of Premixed Lean Diesel Combustion with Extremely Early Staged Fuel injection,” SAE Paper No. 961163 1996
- Nakagome, K. Shimazaki, N. Niimura, K. Kobayashi, S. “Combustion and Emission Characteristics of Premixed Lean Diesel Combustion Engine,” SAE Paper No. 970898 1997
- Yanagihara, H. Sato, Y. Mizuta, J. “A Study of DI Diesel Combustion under Uniform-Highly Dispersed Mixture Formation,” 13th Internal Combust. Engine Symp. 365 369 1996
- Amsden, A. A. O'Rouke, P. J. Butler, T. D. “KIVA II: A Computer Program for Chemically Reactive Flows with Sprays,” Report LA-11560-MS Los Alamos National Laboratory 1989
- Naber, J. D. Reitz, R. D. “Modeling Engine Spray/Wall Impingement,” SAE Paper No. 880107 1988
- Ishiguro, J. Kidoguchi, Y. Ikegami, M. “Three Dimensional Simulation of the Diesel Combustion Process,” JSME Int. J. 31 1 158 165 1988
- Schreiber, M. Sadat Sakak A. Lingens, A. Griffiths, J. F. “A Reduced Thermokinetic Model for The Autoignition of Fuels with Variable Octane Ratings,” 25th Symp. (Int.) on Combust. 933 940 1994
- Magnussen, B. F. Hjertager, B. H. “On Mathematical Modeling of Turbulent Combustion with Special Emphasis on Soot Formation and Combustion,” The 16th Symp. (Int.) on Combust. 719 729 1976
- Harada, A. Shimazaki, N. Sasaki, S. Miyamoto, T. Akagawa, H. Tsujimura, K. “The Effects of Mixture Formation on Premixed Lean Diesel Combustion,” SAE Paper No. 980533 1998