Simplified Three-Dimensional Modeling of Mixture Formation and Combustion in a D.I. Diesel Engine
Published February 1, 1989 by SAE International in United States
Annotation of this paper is available
This paper describes a simplified three-dimensional modeling of the mixture formation and combustion processes in a direct injection (D.I.) diesel engine. The fuel-air mixing and combustion processes in the D.I. diesel engine can be characterized by the combined effects of some processes, such as spray trajectory, fuel vaporization, gas motion, combustion, and dispersion of gaseous components and enthalpy. Each process was computed by a simple sub-model based on the experimental results and empirical equations. The dispersion process was, however, computed by solving the conservation equations of the gaseous components and enthalpy by the finite difference technique. The sub-models were combined for predicting the three-dimensional distributions of the gaseous components and the temperature in the combustion chamber, and finally the cylinder pressure, heat release rate, engine performance and pollutant emissions (NO and soot). An application of this model was made to a small D.I. diesel engine with a bore of 78 mm and a stroke of 86 mm. The computation was made under various intake swirl ratios and piston cavity diameters. Reasonable agreement between computed and experimental results for these engine variables demonstrate that, with appropriate adjustments to the empirical coefficients of each model, the model produces qualitatively realistic predictions of the in-cylinder processes and engine performance.
CitationNishida, K. and Hiroyasu, H., "Simplified Three-Dimensional Modeling of Mixture Formation and Combustion in a D.I. Diesel Engine," SAE Technical Paper 890269, 1989, https://doi.org/10.4271/890269.
- Hiroyasu H., Kadota T., and Arai M., “Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions (Part 1 Combustion Modeling),” Bulletin of the JESM, Vol.26, No.214, p.569 (1983).
- Hiroyasu H., Kadota T., and Arai M., “Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions (Part 2 Computational Procedure and Parametric Study),” Bulletin of the JESM, Vol.26, No.214, p.576 (1983).
- Chiu W.S., Shahed S.H. and Lyn W.T., “A Transient Spray Mixing Model for Diesel Combustion,” SAE Paper 760128.
- Ikegami M., Shioji M. and Koike M., “A Stochastic Approach to Model the Combustion Process in Direct-Injection Diesel Engines,” Proc. 20th Symp. (Int.) Comb., p.217 (1984), The Combustion Institute.
- Mansouri S.H., Heywood J.B. and Radhakrishnan K., “Divided-Chamber Diesel Engine, Part 1: A Cycle-Simulation Which Predicts Performance and Emissions,” SAE Paper 820273.
- Gosman A.D., Harvey R.S., “Computer Analysis of Fuel-Air Mixing and Combustion in Axisymmetric D.I. Diesel,” SAE Paper 820036.
- Murakami A., Arai M. and Hiroyasu H., “Swirl Measurements and Modeling in Direct Injection Diesel Engines,” SAE Paper 880385.
- Fitzgeorge D. and Allison J.L., “Air Swirl in a Road-Vehicle Diesel Engine,” Proc. Instn. Mech. Engrs. (A.D.), No.4, p.151 (1962-63).
- Arai M., Tabata M., Hiroyasu H. and Shimizu M., “Disintegrating Process and Spray Characterization of Fuel Jet Injected by a Diesel Nozzle,” SAE Paper 340275.
- Hiroyasu H. and Kadota T., “Fuel Droplet Size Distribution in Diesel Combustion Chamber,” SAE Paper 740725.
- Hiroyasu H., and Nishida K., “Fuel Spray Trajectory and Dispersion in a D.I. Diesel Combustion Chamber”, 1989 SAE International Congress and Exposition (1989).
- Edelman R.B. and Harsha P.T., “Laminar and Turbulent Gas Dynamics in Combustors -Current Status,” Prog. Energy Combust. Sci., Vol.4, No.1, p.1 (1978).
- Launder B.E. and Spalding D.B., “Mathematical Models of Turbulence,” (1972), Academic Press.
- Khan I.M., Wang D.H.T. and Langridge B.E., “Coagulation and Combustion of Soot Particles in Diesel Engines,” Comb. and Flame, 17, p409 (1971).
- Jones W.P. and Launder B.E., “The Calculation of Low-Reynolds-Number Phenomena with a Two-Equation Model of Turbulence,” Int. J. Heat Mass Transfer, Vol.16, p.1119 (1973).
- Ikegami M., Kidoguchi Y. and Nishiwaki K., “A Multidimensional Model Prediction of Heat Transfer in Non-Fired Engines,” SAE Paper 860467.
- Sakimoto M., “Measurements of In-Cylinder Air Motion in the Direct Injection Diesel Engines,” Master Thesis of Hiroshima University, p.130 (1988). (in Japanese)