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    Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine

    Source: Journal of Engineering for Gas Turbines and Power:;2018:;volume( 140 ):;issue: 009::page 92807
    Author:
    Zhao, Fengnian
    ,
    Ge, Penghui
    ,
    Zhuang, Hanyang
    ,
    Hung, David L. S.
    DOI: 10.1115/1.4039082
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during the early stage of intake stroke, it is very difficult to clearly identify their transient characteristics because these vortices are of multiple length scales with very different swirl motion strength. In this study, a high-speed time-resolved two-dimensional (2D) particle image velocimetry (PIV) is applied to record the flow structure of in-cylinder flow field along a swirl plane at 30 mm below the injector tip. First, a discretized method using flow field velocity vectors is presented to identify the location, strength, and rotating direction of vortices at different crank angles. The transients of vortex formation and dissipation processes are revealed by tracing the location and motion of the vortex center during the intake and compression strokes. In addition, an analysis method known as the wind-rose diagram, which is implemented for meteorological application, has been adopted to show the velocity direction distributions of 100 consecutive cycles. Results show that there exists more than one vortex center during early intake stroke and their fluctuations between each cycle can be clearly visualized. In summary, this approach provides an effective way to identify the vortex structure and to track the motion of vortex center for both large-scale and small-scale vortices.
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      Analysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine

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    contributor authorZhao, Fengnian
    contributor authorGe, Penghui
    contributor authorZhuang, Hanyang
    contributor authorHung, David L. S.
    date accessioned2019-02-28T10:58:50Z
    date available2019-02-28T10:58:50Z
    date copyright6/15/2018 12:00:00 AM
    date issued2018
    identifier issn0742-4795
    identifier othergtp_140_09_092807.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4251382
    description abstractIn-cylinder air flow structure makes significant impacts on fuel spray dispersion, fuel mixture formation, and flame propagation in spark ignition direct injection (SIDI) engines. While flow vortices can be observed during the early stage of intake stroke, it is very difficult to clearly identify their transient characteristics because these vortices are of multiple length scales with very different swirl motion strength. In this study, a high-speed time-resolved two-dimensional (2D) particle image velocimetry (PIV) is applied to record the flow structure of in-cylinder flow field along a swirl plane at 30 mm below the injector tip. First, a discretized method using flow field velocity vectors is presented to identify the location, strength, and rotating direction of vortices at different crank angles. The transients of vortex formation and dissipation processes are revealed by tracing the location and motion of the vortex center during the intake and compression strokes. In addition, an analysis method known as the wind-rose diagram, which is implemented for meteorological application, has been adopted to show the velocity direction distributions of 100 consecutive cycles. Results show that there exists more than one vortex center during early intake stroke and their fluctuations between each cycle can be clearly visualized. In summary, this approach provides an effective way to identify the vortex structure and to track the motion of vortex center for both large-scale and small-scale vortices.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAnalysis of Crank Angle-Resolved Vortex Characteristics Under High Swirl Condition in a Spark-Ignition Direct-Injection Engine
    typeJournal Paper
    journal volume140
    journal issue9
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4039082
    journal fristpage92807
    journal lastpage092807-11
    treeJournal of Engineering for Gas Turbines and Power:;2018:;volume( 140 ):;issue: 009
    contenttypeFulltext
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