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TECHNICAL PAPERS: Internal Combustion Engines

Engine Fuel Droplet High-Pressure Vaporization Modeling

[+] Author and Article Information
G.-S. Zhu, R. D. Reitz

Engine Research Center University of Wisconsin—Madison, 1500 Engineering Drive, Madison, WI 53706

J. Eng. Gas Turbines Power 123(2), 412-418 (Dec 06, 2000) (7 pages) doi:10.1115/1.1361058 History: Received July 11, 2000; Revised December 06, 2000
Copyright © 2001 by ASME
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References

Givler,  S. D., and Abraham,  J., 1996, “Supercritical Droplet Vaporization and Combustion Studies,” Prog. Energy Combust. Sci., 22, pp. 1–28.
Stengele, J., Bauer, H. J., and Wittig, S., 1996, “Numerical Study of Bicomponent Droplet Vaporization in a High-Pressure Environment,” ASME Paper No. 96-GT-442.
Curtis, E. W., Uludogan, A., and Reitz, R. D., 1995, “A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling,” SAE Paper No. 952431.
Aggarwal, S. K., Shu, Z., Mongia, H., and Hura, H. S., 1998, “Multi-component and Single-Component Fuel Droplet Evaporation Under High-Pressure Conditions,” AIAA Paper No. 98-3833.
Zhu, G.-S., and Aggarwal, S. K., 1999, “Fuel Droplet Vaporization in a Supercritical Environment,” ASME Paper No. 99-GT-301.
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Abraham, J., and Givler, S. D., 1999, “Conditions in Which Vaporizing Fuel Drops Reach the Critical State in a Diesel Engine,” SAE Paper No. 1999-01-0511.
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Tamim,  J., and Hallett,  W. L. H., 1995, “Continuous Thermodynamics Model for Multi-Component Vaporization,” Chem. Eng. Sci., 50(18), pp. 2933–2942.
Lippert, A. M., and Reitz, R. D., 1997, “Modeling of Multi-Component Fuels Using Continuous Distributions With Application to Droplet Evaporation and Sprays,” pp. 131–145, SAE Paper No. 972882.
Lippert, A. M., 1999, “Modeling of Multi-Component Fuels With Applications to Sprays and Simulation of Diesel Engine Cold Start,” Ph. D. dissertation, University of Wisconsin, Madison, WI.
Gal-Or,  B., Cullinan,  H. T., and Galli,  R., 1975, “New Thermodynamic-Transport Theory for Systems With Continuous Component Density Distributions, Chem. Eng. Sci., 30, pp. 1085–1092.
Zhu, G.-S., and Reitz, R. D., 2001, “A Model for High-Pressure Vaporization of Droplets of Complex Liquid Mixtures Using Continuous Thermodynamics,” Int. J. Heat Mass Transf., to be published.
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Figures

Grahic Jump Location
Predictions of single-component n-butane-nitrogen, n-heptane-nitrogen, and n-decane-nitrogen vapor-liquid equilibrium systems using semicontinuous vapor-liquid equilibrium model, compared with corresponding experimental data of Knapp et al. 24
Grahic Jump Location
Phase-equilibrium in terms of pressure-temperature diagrams for (a) diesel-nitrogen system, diesel fuel with distribution parameters αL=18.5,βL=10.0, and γL=0.0, and for (b) gasoline-nitrogen system, gasoline fuel with parameters αL=5.7,βL=15.0, and γL=0.0. Solid lines: real fuels; Dashed lines: single-component fuels.
Grahic Jump Location
Critical mixing temperature versus critical mixing pressure for both diesel-nitrogen and gasoline-nitrogen vapor-liquid equilibrium systems. Typical homogenous charge gasoline and diesel engine operating conditions are shown in the cross-hatched regions.
Grahic Jump Location
Surface temperatures (upper) and area regression rates (lower) of droplets versus time at four different reduced pressures. Solid lines: diesel fuel. Dashed lines: single-component fuel.
Grahic Jump Location
Time histories of boiling temperature at reduced pressure of 0.1 and critical mixing temperature at reduced pressure of 3.0 for diesel droplet
Grahic Jump Location
Mass vaporization rate and vapor mole fraction at droplet surface versus time at reduced pressure of Pr=3. Solid lines: diesel fuel. Dashed lines: single-component fuel.
Grahic Jump Location
Mean molecular weight of diesel droplet and variance of diesel liquid phase distribution versus time at three different reduced pressures
Grahic Jump Location
Surface area regression rates of droplets versus time at three different reduced pressures. Solid lines: gasoline fuel. Dashed lines: single-component fuel.
Grahic Jump Location
Normalized lifetimes versus ambient pressure of droplets of diesel and gasoline and the single-component counterpart fuels. Solid lines: real fuels. Dashed lines: single-component fuels.

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