Characterization of the effect of fatty ester composition on the ignition behavior of biodiesel fuel sprays

Casey Allen, Elisa Toulson, Daniel Tepe, Harold Schock, Dennis Miller, Tonghun Lee

    Research output: Research - peer-reviewArticle

    • 14 Citations

    Abstract

    The effect of fatty ester composition on the combustion behavior of biodiesel fuel sprays is investigated for soy-based methyl esters, canola-based methyl esters and canola-based butyl esters. The purpose of this study is to aid fuel engineering efforts by identifying molecular structure features of biodiesel which can influence the compression ignition process during direct biodiesel utilization in diesel engines. Combustion behavior is classified through ignition delays and maximum apparent heat release rates measured in a rapid compression machine, and these measurements have been taken at the low temperatures (676-815 K) and reduced oxygen concentrations (12% and 18%) corresponding to the low temperature combustion regime of advanced diesel engines. Ignition delay measurements show that the appearance of first heat release from the fuels is decreasingly sensitive to oxygen concentration as the reaction zone temperature is increased. Growth in the ester alkoxy chain length from one to four carbon atoms had minimal effect on the ignition delay. For tests in 12% oxygen, the increased polyunsaturated of soy methyl esters relative to canola methyl esters leads to longer ignition delays. This is not observed using 18% oxygen where physical transport processes are more important. The canola butyl esters exhibited the largest peak values for heat release rates, with the distinction becoming clear at reaction zone temperatures above 750 K. Normalization on ignition delay and input energy bases indicates that variation of the maximum apparent heat release rates among the fuels is primarily due to unique mixing times and fuel heating values.

    LanguageEnglish (US)
    Pages659-669
    Number of pages11
    JournalFuel
    Volume111
    DOIs
    StatePublished - 2013

    Profile

    Biofuels
    Ignition
    Esters
    Chemical analysis
    Biodiesel
    Oxygen
    Temperature
    Hot Temperature
    Diesel engines
    Chain length
    Molecular structure
    Carbon
    Heating
    Atoms
    alkoxyl radical

    Keywords

    • Autoignition
    • Biodiesel
    • Fatty esters
    • Low temperature combustion
    • Spray ignition

    ASJC Scopus subject areas

    • Fuel Technology
    • Energy Engineering and Power Technology
    • Chemical Engineering(all)
    • Organic Chemistry

    Cite this

    Characterization of the effect of fatty ester composition on the ignition behavior of biodiesel fuel sprays. / Allen, Casey; Toulson, Elisa; Tepe, Daniel; Schock, Harold; Miller, Dennis; Lee, Tonghun.

    In: Fuel, Vol. 111, 2013, p. 659-669.

    Research output: Research - peer-reviewArticle

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    abstract = "The effect of fatty ester composition on the combustion behavior of biodiesel fuel sprays is investigated for soy-based methyl esters, canola-based methyl esters and canola-based butyl esters. The purpose of this study is to aid fuel engineering efforts by identifying molecular structure features of biodiesel which can influence the compression ignition process during direct biodiesel utilization in diesel engines. Combustion behavior is classified through ignition delays and maximum apparent heat release rates measured in a rapid compression machine, and these measurements have been taken at the low temperatures (676-815 K) and reduced oxygen concentrations (12% and 18%) corresponding to the low temperature combustion regime of advanced diesel engines. Ignition delay measurements show that the appearance of first heat release from the fuels is decreasingly sensitive to oxygen concentration as the reaction zone temperature is increased. Growth in the ester alkoxy chain length from one to four carbon atoms had minimal effect on the ignition delay. For tests in 12% oxygen, the increased polyunsaturated of soy methyl esters relative to canola methyl esters leads to longer ignition delays. This is not observed using 18% oxygen where physical transport processes are more important. The canola butyl esters exhibited the largest peak values for heat release rates, with the distinction becoming clear at reaction zone temperatures above 750 K. Normalization on ignition delay and input energy bases indicates that variation of the maximum apparent heat release rates among the fuels is primarily due to unique mixing times and fuel heating values.",
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    AU - Miller,Dennis

    AU - Lee,Tonghun

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