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    Similarity Behavior in Transitional Boundary Layers Over a Range of Adverse Pressure Gradients and Turbulence Levels

    Source: Journal of Turbomachinery:;1991:;volume( 113 ):;issue: 004::page 617
    Author:
    J. P. Gostelow
    ,
    G. J. Walker
    DOI: 10.1115/1.2929125
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Boundary layer transition has been investigated experimentally under low, moderate, and high free-stream turbulence levels and varying adverse pressure gradients. Under high turbulence levels and adverse pressure gradients a pronounced subtransition was present. A strong degree of similarity in intermittency distributions was observed, for all conditions, when the Narasimha procedure for determination of transition inception was used. Effects of free-stream turbulence on the velocity profile are particularly strong for the laminar boundary layer upstream of the transition region. This could reflect the influence of the turbulence on the shear stress distribution throughout the layer and this matter needs further attention. The velocity profiles in wall coordinates undershoot the turbulent wall layer asymptote near the wall over most of the transition region. The rapidity with which transition occurs under adverse pressure gradients produces strong lag effects on the velocity profile; the starting turbulent boundary layer velocity profile may depart significantly from local equilibrium conditions. The practice of deriving integral properties and skin friction for transitional boundary layers by a linear combination of laminar and turbulent values for equilibrium layers is inconsistent with the observed lag effects. The velocity profile responds sufficiently slowly to the perturbation imposed by transition that much of the anticipated drop in form factor will not have occurred prior to the completion of transition. This calls into question both experimental techniques, which rely on measured form factor to characterize transition, and boundary layer calculations, which rely on local equilibrium assumptions in the vicinity of transition.
    keyword(s): Turbulence , Boundary layers , Pressure gradient , Equilibrium (Physics) , Skin friction (Fluid dynamics) , Shear (Mechanics) , Stress concentration , Boundary layer turbulence , Drops AND Matter ,
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      Similarity Behavior in Transitional Boundary Layers Over a Range of Adverse Pressure Gradients and Turbulence Levels

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    http://yetl.yabesh.ir/yetl1/handle/yetl/109355
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    contributor authorJ. P. Gostelow
    contributor authorG. J. Walker
    date accessioned2017-05-08T23:36:54Z
    date available2017-05-08T23:36:54Z
    date copyrightOctober, 1991
    date issued1991
    identifier issn0889-504X
    identifier otherJOTUEI-28615#617_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/109355
    description abstractBoundary layer transition has been investigated experimentally under low, moderate, and high free-stream turbulence levels and varying adverse pressure gradients. Under high turbulence levels and adverse pressure gradients a pronounced subtransition was present. A strong degree of similarity in intermittency distributions was observed, for all conditions, when the Narasimha procedure for determination of transition inception was used. Effects of free-stream turbulence on the velocity profile are particularly strong for the laminar boundary layer upstream of the transition region. This could reflect the influence of the turbulence on the shear stress distribution throughout the layer and this matter needs further attention. The velocity profiles in wall coordinates undershoot the turbulent wall layer asymptote near the wall over most of the transition region. The rapidity with which transition occurs under adverse pressure gradients produces strong lag effects on the velocity profile; the starting turbulent boundary layer velocity profile may depart significantly from local equilibrium conditions. The practice of deriving integral properties and skin friction for transitional boundary layers by a linear combination of laminar and turbulent values for equilibrium layers is inconsistent with the observed lag effects. The velocity profile responds sufficiently slowly to the perturbation imposed by transition that much of the anticipated drop in form factor will not have occurred prior to the completion of transition. This calls into question both experimental techniques, which rely on measured form factor to characterize transition, and boundary layer calculations, which rely on local equilibrium assumptions in the vicinity of transition.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSimilarity Behavior in Transitional Boundary Layers Over a Range of Adverse Pressure Gradients and Turbulence Levels
    typeJournal Paper
    journal volume113
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.2929125
    journal fristpage617
    journal lastpage624
    identifier eissn1528-8900
    keywordsTurbulence
    keywordsBoundary layers
    keywordsPressure gradient
    keywordsEquilibrium (Physics)
    keywordsSkin friction (Fluid dynamics)
    keywordsShear (Mechanics)
    keywordsStress concentration
    keywordsBoundary layer turbulence
    keywordsDrops AND Matter
    treeJournal of Turbomachinery:;1991:;volume( 113 ):;issue: 004
    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
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