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    High Fidelity Simulations of Low Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses

    Source: Journal of Turbomachinery:;2016:;volume( 138 ):;issue: 011::page 111006
    Author:
    Michelassi, V.
    ,
    Chen, L.
    ,
    Pichler, R.
    ,
    Sandberg, R.
    ,
    Bhaskaran, R.
    DOI: 10.1115/1.4033266
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Large eddy simulations validated with the aid of direct numerical simulation (DNS) are used to study the concerted action of reduced frequency and flow coefficient on the performance of the T106A lowpressure turbine profile. The simulations are carried out by using a discretization in space and time that allows minimizing the accuracy loss with respect to DNS. The reference Reynolds number is 100,000, while reduced frequency and flow coefficient cover a range wide enough to provide valid qualitative information to designers. The various configurations reveal differences in the loss generation mechanism that blends steady and unsteady boundary layer losses with unsteady wake ingestion losses. Large values of the flow coefficient can alter the pressure side unsteadiness and the consequent loss generation. Low values of the flow coefficient are associated with wake fogging and reduced unsteadiness around the blade. The reduced frequency further modulates these effects. The simulations also reveal a clear trend of losses with the wake path, discussed by conducting a lossbreakdown analysis that distinguishes boundary layer from wake distortion losses.
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      High Fidelity Simulations of Low Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses

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    http://yetl.yabesh.ir/yetl1/handle/yetl/162824
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    • Journal of Turbomachinery

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    contributor authorMichelassi, V.
    contributor authorChen, L.
    contributor authorPichler, R.
    contributor authorSandberg, R.
    contributor authorBhaskaran, R.
    date accessioned2017-05-09T01:34:25Z
    date available2017-05-09T01:34:25Z
    date issued2016
    identifier issn0889-504X
    identifier otherturbo_138_11_111007.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/162824
    description abstractLarge eddy simulations validated with the aid of direct numerical simulation (DNS) are used to study the concerted action of reduced frequency and flow coefficient on the performance of the T106A lowpressure turbine profile. The simulations are carried out by using a discretization in space and time that allows minimizing the accuracy loss with respect to DNS. The reference Reynolds number is 100,000, while reduced frequency and flow coefficient cover a range wide enough to provide valid qualitative information to designers. The various configurations reveal differences in the loss generation mechanism that blends steady and unsteady boundary layer losses with unsteady wake ingestion losses. Large values of the flow coefficient can alter the pressure side unsteadiness and the consequent loss generation. Low values of the flow coefficient are associated with wake fogging and reduced unsteadiness around the blade. The reduced frequency further modulates these effects. The simulations also reveal a clear trend of losses with the wake path, discussed by conducting a lossbreakdown analysis that distinguishes boundary layer from wake distortion losses.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHigh Fidelity Simulations of Low Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses
    typeJournal Paper
    journal volume138
    journal issue11
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4033266
    journal fristpage111006
    journal lastpage111006
    identifier eissn1528-8900
    treeJournal of Turbomachinery:;2016:;volume( 138 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian