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    Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

    Source: Journal of Engineering for Gas Turbines and Power:;2013:;volume( 135 ):;issue: 008::page 81501
    Author:
    Gأ¼ralp, Orgun
    ,
    Najt, Paul
    ,
    Filipi, Zoran S.
    DOI: 10.1115/1.4024180
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Homogeneous charge compression ignition (HCCI) combustion is widely regarded as an attractive option for future high efficiency gasoline engines. HCCI combustion permits operation with a highly dilute, well mixed charge, resulting in high thermal efficiency and extremely low NOx and soot emissions, two qualities essential for future propulsion system solutions. Because HCCI is a thermokinetically dominated process, full understanding of how combustion chamber boundary thermal conditions affect the combustion process are crucial. This includes the dynamics of the effective chamber wall surface temperature, as dictated by the formation of combustion chamber deposits (CCD). It has been demonstrated that, due to the combination of CCD thermal properties and the sensitivity of HCCI to wall temperature, the phasing of autoignition can vary significantly as CCD coverage in the chamber increases. In order to better characterize and quantify the influence of CCDs, a numerical methodology has been developed which permits calculation of the crankangle resolved local temperature profile at the surface of a layer of combustion chamber deposits. This unique predictorcorrector methodology relies on experimental measurement of instantaneous temperature underneath the layer, i.e., at the metalCCD interface, and known deposit layer thickness. A numerical method for validation of these calculations has also been devised. The resultant crankangle resolved CCD surface temperature and heat flux profiles both on top and under the CCD layer provide valuable insight into the near wall phenomena, and shed light on the interplay between the dynamics of the heat transfer process and HCCI burn rates.
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      Method for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine

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    contributor authorGأ¼ralp, Orgun
    contributor authorNajt, Paul
    contributor authorFilipi, Zoran S.
    date accessioned2017-05-09T00:58:23Z
    date available2017-05-09T00:58:23Z
    date issued2013
    identifier issn1528-8919
    identifier othergtp_135_8_081501.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/151655
    description abstractHomogeneous charge compression ignition (HCCI) combustion is widely regarded as an attractive option for future high efficiency gasoline engines. HCCI combustion permits operation with a highly dilute, well mixed charge, resulting in high thermal efficiency and extremely low NOx and soot emissions, two qualities essential for future propulsion system solutions. Because HCCI is a thermokinetically dominated process, full understanding of how combustion chamber boundary thermal conditions affect the combustion process are crucial. This includes the dynamics of the effective chamber wall surface temperature, as dictated by the formation of combustion chamber deposits (CCD). It has been demonstrated that, due to the combination of CCD thermal properties and the sensitivity of HCCI to wall temperature, the phasing of autoignition can vary significantly as CCD coverage in the chamber increases. In order to better characterize and quantify the influence of CCDs, a numerical methodology has been developed which permits calculation of the crankangle resolved local temperature profile at the surface of a layer of combustion chamber deposits. This unique predictorcorrector methodology relies on experimental measurement of instantaneous temperature underneath the layer, i.e., at the metalCCD interface, and known deposit layer thickness. A numerical method for validation of these calculations has also been devised. The resultant crankangle resolved CCD surface temperature and heat flux profiles both on top and under the CCD layer provide valuable insight into the near wall phenomena, and shed light on the interplay between the dynamics of the heat transfer process and HCCI burn rates.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleMethod for Determining Instantaneous Temperature at the Surface of Combustion Chamber Deposits in an HCCI Engine
    typeJournal Paper
    journal volume135
    journal issue8
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4024180
    journal fristpage81501
    journal lastpage81501
    identifier eissn0742-4795
    treeJournal of Engineering for Gas Turbines and Power:;2013:;volume( 135 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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