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    Effect of Piston Crevices on the Numerical Simulation of a Heavy-Duty Diesel Engine Retrofitted to Natural-Gas Spark-Ignition Operation

    Source: Journal of Energy Resources Technology:;2019:;volume 141:;issue 011::page 112204
    Author:
    Stocchi, Iolanda
    ,
    Liu, Jinlong
    ,
    Dumitrescu, Cosmin Emil
    ,
    Battistoni, Michele
    ,
    Grimaldi, Carlo Nazareno
    DOI: 10.1115/1.4043709
    Publisher: American Society of Mechanical Engineers (ASME)
    Abstract: Three-dimensional computational fluid dynamics internal combustion engine simulations that use a simplified combustion model based on the flamelet concept provide acceptable results with minimum computational costs and reasonable running times. Moreover, the simulation can neglect small combustion chamber details such as valve crevices, valve recesses, and piston crevices volume. The missing volumes are usually compensated by changes in the squish volume (i.e., by increasing the clearance height of the model compared to the real engine). This paper documents some of the effects that such an approach would have on the simulated results of the combustion phenomena inside a conventional heavy-duty direct injection compression-ignition engine, which was converted to port fuel injection spark ignition operation. Numerical engine simulations with or without crevice volumes were run using the G-equation combustion model. A proper parameter choice ensured that the numerical results agreed well with the experimental pressure trace and the heat release rate. The results show that including the crevice volume affected the mass of a unburned mixture inside the squish region, which in turn influenced the flame behavior and heat release during late-combustion stages.
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      Effect of Piston Crevices on the Numerical Simulation of a Heavy-Duty Diesel Engine Retrofitted to Natural-Gas Spark-Ignition Operation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4258008
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    contributor authorStocchi, Iolanda
    contributor authorLiu, Jinlong
    contributor authorDumitrescu, Cosmin Emil
    contributor authorBattistoni, Michele
    contributor authorGrimaldi, Carlo Nazareno
    date accessioned2019-09-18T09:01:36Z
    date available2019-09-18T09:01:36Z
    date copyright5/17/2019 12:00:00 AM
    date issued2019
    identifier issn0195-0738
    identifier otherjert_141_11_112204
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4258008
    description abstractThree-dimensional computational fluid dynamics internal combustion engine simulations that use a simplified combustion model based on the flamelet concept provide acceptable results with minimum computational costs and reasonable running times. Moreover, the simulation can neglect small combustion chamber details such as valve crevices, valve recesses, and piston crevices volume. The missing volumes are usually compensated by changes in the squish volume (i.e., by increasing the clearance height of the model compared to the real engine). This paper documents some of the effects that such an approach would have on the simulated results of the combustion phenomena inside a conventional heavy-duty direct injection compression-ignition engine, which was converted to port fuel injection spark ignition operation. Numerical engine simulations with or without crevice volumes were run using the G-equation combustion model. A proper parameter choice ensured that the numerical results agreed well with the experimental pressure trace and the heat release rate. The results show that including the crevice volume affected the mass of a unburned mixture inside the squish region, which in turn influenced the flame behavior and heat release during late-combustion stages.
    publisherAmerican Society of Mechanical Engineers (ASME)
    titleEffect of Piston Crevices on the Numerical Simulation of a Heavy-Duty Diesel Engine Retrofitted to Natural-Gas Spark-Ignition Operation
    typeJournal Paper
    journal volume141
    journal issue11
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.4043709
    journal fristpage112204
    journal lastpage112204-8
    treeJournal of Energy Resources Technology:;2019:;volume 141:;issue 011
    contenttypeFulltext
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