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Research Papers: Internal Combustion Engines

A Continuous Multicomponent Fuel Flame Propagation and Chemical Kinetics Model

[+] Author and Article Information
Shiyou Yang, Rolf D. Reitz

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

J. Eng. Gas Turbines Power 132(7), 072802 (Apr 14, 2010) (7 pages) doi:10.1115/1.4000267 History: Received April 30, 2009; Revised August 29, 2009; Published April 14, 2010; Online April 14, 2010

A continuous multicomponent fuel flame propagation and chemical kinetics model has been developed. In the multicomponent fuel model, the theory of continuous thermodynamics was used to model the properties and composition of fuels such as gasoline. The difference between the current continuous multicomponent fuel model and previous similar models in the literature is that the source terms contributed by chemistry in the mean and the second moment transport equations have been considered. This new model was validated using results from a discrete multicomponent fuel model. In the flame propagation and chemical kinetics model, five improved combustion submodels were also integrated with the new continuous multicomponent fuel model. To consider the change in local fuel vapor mixture composition, a “primary reference fuel (PRF) adaptive” method is proposed that formulates a relationship between the fuel vapor mixture PRF number (or research octane number) and the fuel vapor mixture composition based on the mean molecular weight and/or variance of the fuel vapor mixture composition in each cell. Simulations of single droplet vaporization with a single-component fuel (iso-octane) were compared with multicomponent fuel cases.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Cetane number as a function of paraffin (alkane) molecular weight (after Rose and Cooper (16))

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Figure 2

RON as a function of computational cell fuel vapor mixture mean molecular weight

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Figure 3

Subgrid scale unburned/burnt regions

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Figure 4

Evaporation of a stagnant gasoline droplet in quiescent ambient air. (a) Mean of composition and square of diameter of droplet, (b) square root of variance and the evaporation constant, and (c) droplet surface fuel mass fraction and interior temperature.

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Figure 5

Predicted history of the droplet interior temperature for gasoline and iso-octane droplets

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Figure 6

Comparison of surface regression profiles for gasoline and iso-octane at two ambient temperatures

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Figure 7

Comparison of profiles of droplet interior temperature and surface temperature of iso-octane and gasoline vaporization

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Figure 8

Comparison between DMC and “old CMC”

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Figure 9

Comparison between DMC and “new CMC”

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