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    Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion

    Source: Journal of Turbomachinery:;2019:;volume( 141 ):;issue: 002::page 21010
    Author:
    Daroukh, Majd
    ,
    Moreau, Stéphane
    ,
    Gourdain, Nicolas
    ,
    Boussuge, Jean-François
    ,
    Sensiau, Claude
    DOI: 10.1115/1.4042163
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Ultra-high bypass ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous outlet guide vanes (OGVs). The flow close to the fan is therefore circumferentially nonuniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the unsteady Reynolds-averaged Navier–Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs, and homogeneous inlet guide vanes (IGVs). Direct acoustic predictions are given for both inlet and aft noises. A novel hydrodynamic/acoustic splitting method based on a modal decomposition is developed and is applied for the aft noise analysis. The noise mechanisms that are generally considered (i.e., interaction of fan-blade wakes with OGVs and fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction between the stationary distortion and the fan blades appear and contribute to the inlet noise.
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      Tonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4255739
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    contributor authorDaroukh, Majd
    contributor authorMoreau, Stéphane
    contributor authorGourdain, Nicolas
    contributor authorBoussuge, Jean-François
    contributor authorSensiau, Claude
    date accessioned2019-03-17T09:52:02Z
    date available2019-03-17T09:52:02Z
    date copyright1/31/2019 12:00:00 AM
    date issued2019
    identifier issn0889-504X
    identifier otherturbo_141_02_021010.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4255739
    description abstractUltra-high bypass ratio (UHBR) engines are designed as compact as possible and are characterized by a short asymmetric air inlet and heterogeneous outlet guide vanes (OGVs). The flow close to the fan is therefore circumferentially nonuniform (or distorted) and the resulting noise might be impacted. This is studied here at take-off conditions by means of a simulation of the unsteady Reynolds-averaged Navier–Stokes (URANS) equations of a full-annulus fan stage. The model includes an asymmetric air inlet, a fan, heterogeneous OGVs, and homogeneous inlet guide vanes (IGVs). Direct acoustic predictions are given for both inlet and aft noises. A novel hydrodynamic/acoustic splitting method based on a modal decomposition is developed and is applied for the aft noise analysis. The noise mechanisms that are generally considered (i.e., interaction of fan-blade wakes with OGVs and fan self-noise) are shown to be impacted by the distortion. In addition, new sources caused by the interaction between the stationary distortion and the fan blades appear and contribute to the inlet noise.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleTonal Noise Prediction of a Modern Turbofan Engine With Large Upstream and Downstream Distortion
    typeJournal Paper
    journal volume141
    journal issue2
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4042163
    journal fristpage21010
    journal lastpage021010-11
    treeJournal of Turbomachinery:;2019:;volume( 141 ):;issue: 002
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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