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Modeling of Multicomponent Fuels Using Continuous Distributions with Application to Droplet Evaporation and Sprays
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Abstract
In multidimensional modeling, fuels have been represented predominantly by single components, such as octane for gasoline. Several bicomponent studies have been performed, but these are still limited in their ability to represent real fuels, which are blends of as many as 300 components. This study outlines a method by which the fuel composition is represented by a distribution function of the fuel molecular weight. This allows a much wider range of compositions to be modeled, and only requires including two additional “species” besides the fuel, namely the mean and second moment of the distribution. This approach has been previously presented but is applied here to multidimensional calculations. Results are presented for single component droplet vaporization for comparison with single component fuel predictions, as well as results for a multicomponent gasoline and a diesel droplet. The latter illustrate the important differences between the vaporization characteristics of a multicomponent droplet compared to a single component droplet. The present approach was also applied to a gasoline hollow cone spray, illustrating not only the prediction of fuel vapor locations, but also of fuel composition variations within the spray. This, combined with knowledge of the local equivalence ratio, may be important in determining spark plug locations, unburned hydrocarbon emissions, and flame and wall quenching processes in direct injection engines.
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Lippert, A. and Reitz, R., "Modeling of Multicomponent Fuels Using Continuous Distributions with Application to Droplet Evaporation and Sprays," SAE Technical Paper 972882, 1997, https://doi.org/10.4271/972882.Also In
References
- Jin J. D. Borman G. L. “A Model for Multicomponent Droplet Vaporization at High Ambient Pressures,” SAE Paper 850264 1985
- Ayoub N. S. Reitz R. D. “Multidimensional Modeling of Fuel Effects and Split Injections on Diesel Engine Cold Starting,” AIAA Journal of Propulsion and Power 13 1 123 130 1997
- Cotterman R. L. Bender R. Prausnitz J. M. “Phase Equilibria for Mixtures Containing Very Many Components: Development and Application of Continuous Thermodynamics for Chemical Process Design,” Ind Eng Chem Process Des Dev 24 194 203 1985
- Briano J. G. Glandt E. D. “Molecular Thermodynamics of Continuous Mixtures,” Fluid Phase Equilibria 14 91 102 1983
- Chou G. F. Prausnitz J. M. “Adiabatic Flash Calculations For Continuous or Semicontinuous Mixtures Using an Equation of State,” Fluid Phase Equilibria 30 75 82 1986
- Whitson C. H. “Characterizing Hydrocarbon Plus Fractions,” Soc Petroleum Engineers Jnl 1983 683 694 1983
- Rätzsch M. T. Kehlen H. “Continuous Thermodynamics of Complex Mixtures,” Fluid Phase Equilibria 14 225 234 1983
- Tamim J. Hallett W.L.H. “Continuous Thermodynamics Model For Multicomponent Vaporization,” Chem Engr Sci 50 18 2933 2942 1995
- Cotterman R. L. Prausnitz J. M. “Flash Calculations for Continuous or Semicontinuous Mixtures Using an Equation of State,” Ind Eng Chem Process Des Dev 23 434 443 1985
- Law C. K. “Multicomponent Droplet Combustion with Rapid Internal Mixing,” Combustion and Flame 26 219 233 1976
- Kuo K. K. Principles of Combustion John Wiley & Sons 1986
- Turns S. R. An Introduction to Combustion McGraw Hill 1996
- Shibata S. K. Sandler S. I. Behrens R. A. “Phase Equilibrium Calculations for Continuous and Semicontinuous Mixtures,” Chem Eng Sci 42 1977 1988 1987
- Amsden A. A. O'Rourke P. J. Butler T. D. “KIVA-II - A Computer Program for Chemically Reactive Flows with Sprays,” Los Alamos National Labs. 1989
- Sirignano W. A. “Fuel Droplet Vaporization and Spray Combustion Theory,” Prog Energy Combust Sci 9 291 322 1983
- Arcoumanis C. Gavaises M. French B. “Effect of Fuel Injection Processes on the Structure of Diesel Sprays,” SAE Paper 970799 1997
- Law C. K. “Recent Advances in Droplet Vaporization and Combustion,” Prog Energy Combust Sci 8 171 201 1982
- Frössling Beitr. Geophys. 52 170 216 1938
- Hallett W. L. H. Personal Communication 1996
- Lefebvre A. H. Atomization and Sprays Hemisphere 1989
- Han Z. Reitz R. D. Claybaker P. J. Rutland C. J. “Modeling the Effects of Intake Flow Structures on Fuel/Air Mixing in a Direct-Injected Spark-Ignition Engine,” SAE Paper 961192 1996
- Kent J. C. “Quasi-Steady Diffusion-Controlled Droplet Evaporation and Condensation,” Appl Sci Res 28 315 345 1973
- Hallett W. L. H. “A Simple Quasi-Steady Droplet Evaporation Model Using Continuous Thermodynamics,” The Combustion Institute Spring Technical Meeting 1997
- Chin J. S. Lefebvre A. H. “Steady-State Evaporation Characteristics of Hydrocarbon Fuel Drops,” AIAA Journal 21 1437 1443 1983
- Han Z. Parrish S. E. Farrell P. V. Reitz R. D. “Modeling Atomization Processes of Pressure-Swirl Hollow-Cone Fuel Sprays,” Atomization and Sprays 1996
- Han Z. Reitz R. D. Internal Structure of Vaporizing Pressure-Swirl Fuel Sprays Seoul, Korea 1997
- Han Z. Numerical Study of Air-Fuel Mixing in Direct-Injection Spark-Ignition and Diesel Engines University of Wisconsin-Madison 1996
- Parrish S. E. University of Wisconsin-Madison 1997
- O'Rourke P.J. Amsden A. A. “The TAB Method for Numerical Calculation of Spray Droplet Breakup,” SAE Paper 872089 1987