A phenomenological combustion model for direct-injection, compression-ignition engines

This paper describes the development and use of a phenomenological model for combustion in direct-injection diesel engines. The model is based on the analysis of the fuel evolution from the injection start till the combustion end. The fuel evolution is modelled by studying the spray atomization, penetration, air entrainment, and evaporation; the air motion; the ignition delay; and the combustion. The model consists of analytical and semiempirical submodels for each of the above-mentioned phenomena, with a special emphasis on the spray behaviour during the atomization process and after the impingement against the walls. The model gives the amounts of fuel atomized, vaporized, and burned, and the amounts of air entrained and burned. The heat released by fuel combustion is used to compute the pressure evolution in the combustion chamber. An application of the model is made for a real engine, and a comparison between experimental and calculated pressure diagrams is presented, showing a good agreement.

[1]  Frediano V. Bracco,et al.  Computations of drop sizes in pulsating sprays and of liquid-core length in vaporizing sprays , 1982 .

[2]  G. Woschni.  A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine , 1967 .

[3]  H. Hiroyasu,et al.  Fuel Droplet Size Distribution in Diesel Combustion Chamber , 1974 .

[4]  A. D. Gosman,et al.  Calculation of three dimensional spray motion in engines , 1986 .

[5]  N. D. Whitehouse,et al.  The Effect of Changes in Design and Operating Conditions on Heat Release in Direct-Injection Diesel Engines , 1974 .

[6]  A. Alkidas.  The influence of size-distribution parameters on the evaporation of polydisperse dilute sprays , 1981 .

[7]  G. Faeth.  Evaporation and combustion of sprays , 1983 .

[8]  Jim Swithenbank,et al.  Three-Dimensional Model of Spray Combustion in Gas Turbine Combustors , 1982 .

[9]  F. P. Ricou,et al.  Measurements of entrainment by axisymmetrical turbulent jets , 1961, Journal of Fluid Mechanics.

[10]  Masataka Arai,et al.  SOOT FORMATION AND OXIDATION IN DIESEL ENGINES , 1980 .

[11]  W-T. Lyn,et al.  The Evaporation and Mixing of a Liquid Fuel Spray in a Diesel Air Swirl , 1969 .

[12]  D. Hodgetts,et al.  SIMULATION AND OPTIMIZATION OF THERMODYNAMIC PROCESSES OF DIESEL ENGINE. , 1974 .

[13]  Masataka Arai,et al.  Supplementary Comments: Fuel Spray Characterization in Diesel Engines , 1980 .

[14]  W. S. Chiu,et al.  A TRANSIENT SPRAY MIXING MODEL FOR DIESEL COMBUSTION , 1976 .

[15]  J. C. Dent.  A basis for the comparison of various experimental methods for studying spray penetration. , 1971 .

[16]  A. D. Gosman,et al.  COMPUTER ANALYSIS OF FUEL-AIR MIXING IN DIRECT-INJECTION ENGINES , 1980 .

[17]  J. M. Rife,et al.  PERFORMANCE AND NO X MODEL OF A DIRECT INJECTION STRATIFIED CHARGE ENGINE , 1980 .

[18]  J. C. Dent,et al.  Interferometric Studies of Vapourising and Combusting Sprays , 1983 .

[19]  W. Ranz.  Evaporation from drops : Part II , 1952 .

[20]  W. S. Chiu,et al.  A Preliminary Model for the Formation of Nitric Oxide in Direct Injection Diesel Engines and Its Application in Parametric Studies , 1973 .

[21]  G. Greeves,et al.  Factors Affecting Smoke and Gaseous Emissions from Direct Injection Engines and a Method of Calculation , 1973 .

[22]  Akihito Nagao,et al.  Prediction of ln-Cylinder Flow and Spray Formation Effects on Combustion in Direct Injection Diesel Engines , 1985 .

[23]  G. Greeves,et al.  Response of Diesel Combustion Systems to Increase of Fuel Injection Rate , 1979 .

[24]  H. Hiroyasu,et al.  Development and Use of a Spray Combustion Modeling to Predict Diesel Engine Efficiency and Pollutant Emissions : Part 1 Combustion Modeling , 1983 .

[25]  J. C. Dent,et al.  Phenomenological combustion model for a quiescent chamber diesel engine , 1981 .

[26]  A. D. Gosman,et al.  Computer Analysis of Fuel-Air Mixing and Combustion in an Axisymmetric D.I Diesel , 1982 .

[27]  R. Reitz,et al.  On the Dependence of Spray Angle and Other Spray Parameters on Nozzle Design and Operating Conditions , 1979 .

[28]  W. E. Ranz,et al.  Evaporation from drops , 1952 .

[29]  J. C. Dent,et al.  Phenomenological diesel combustion model including smoke and NO emission , 1986 .

[30]  Hikaru Kuniyoshi,et al.  Investigation on the Initial Part and the Spray Formation Delay of Diesel Spray , 1983 .

[31]  The effects of engine speed and injection characteristics on the flow field and fuel/air mixing in motored two-stroke diesel engines , 1987 .

[32]  S. M. Shahed,et al.  A Numerical Study of the Transient Evaporating Spray Mixing Process in the Diesel Environment , 1983 .