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    Calculation of Wake-Induced Unsteady Flow in a Turbine Cascade

    Source: Journal of Turbomachinery:;1993:;volume( 115 ):;issue: 004::page 675
    Author:
    N.-H. Cho
    ,
    X. Liu
    ,
    W. Rodi
    ,
    B. Schönung
    DOI: 10.1115/1.2929302
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Numerical predictions are reported for two-dimensional unsteady flow in a linear turbine cascade, where the unsteadiness is caused by passing wakes generated by the preceding row of blades. In particular, an experiment is simulated in which the passing wakes were generated by cylinders moving on a rotating squirrel cage. Blade-to-blade calculations were carried out by solving the unsteady two dimensional flow equations with an accurate finite-volume procedure, thereby resolving the periodic unsteady motion. The effects of stochastic turbulent fluctuations are simulated with a two-layer turbulence model, in which the standard k–ε model is applied in the bulk of the flow and a one-equation model in the near-wall region. This involves also a transition model based on an empirical formula from Abu-Ghannam and Shaw (1980), which was adapted for the unsteady situation by applying it in a Lagrangian way, following fluid parcels in the boundary layer under disturbed and undisturbed free streams on their travel downstream. The calculations are compared with experiments for various wake-passing frequencies. On the whole, the complex unsteady flow behavior is simulated realistically, including the moving forward of transition when the wake-passing frequency increases, but not all details can be reproduced.
    keyword(s): Cascades (Fluid dynamics) , Wakes , Turbines , Unsteady flow , Blades , Flow (Dynamics) , Turbulence , Equations , Formulas , Frequency , Travel , Fluids , Motion , Fluctuations (Physics) , Cylinders AND Boundary layers ,
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      Calculation of Wake-Induced Unsteady Flow in a Turbine Cascade

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/112754
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    contributor authorN.-H. Cho
    contributor authorX. Liu
    contributor authorW. Rodi
    contributor authorB. Schönung
    date accessioned2017-05-08T23:42:46Z
    date available2017-05-08T23:42:46Z
    date copyrightOctober, 1993
    date issued1993
    identifier issn0889-504X
    identifier otherJOTUEI-28633#675_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/112754
    description abstractNumerical predictions are reported for two-dimensional unsteady flow in a linear turbine cascade, where the unsteadiness is caused by passing wakes generated by the preceding row of blades. In particular, an experiment is simulated in which the passing wakes were generated by cylinders moving on a rotating squirrel cage. Blade-to-blade calculations were carried out by solving the unsteady two dimensional flow equations with an accurate finite-volume procedure, thereby resolving the periodic unsteady motion. The effects of stochastic turbulent fluctuations are simulated with a two-layer turbulence model, in which the standard k–ε model is applied in the bulk of the flow and a one-equation model in the near-wall region. This involves also a transition model based on an empirical formula from Abu-Ghannam and Shaw (1980), which was adapted for the unsteady situation by applying it in a Lagrangian way, following fluid parcels in the boundary layer under disturbed and undisturbed free streams on their travel downstream. The calculations are compared with experiments for various wake-passing frequencies. On the whole, the complex unsteady flow behavior is simulated realistically, including the moving forward of transition when the wake-passing frequency increases, but not all details can be reproduced.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleCalculation of Wake-Induced Unsteady Flow in a Turbine Cascade
    typeJournal Paper
    journal volume115
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.2929302
    journal fristpage675
    journal lastpage686
    identifier eissn1528-8900
    keywordsCascades (Fluid dynamics)
    keywordsWakes
    keywordsTurbines
    keywordsUnsteady flow
    keywordsBlades
    keywordsFlow (Dynamics)
    keywordsTurbulence
    keywordsEquations
    keywordsFormulas
    keywordsFrequency
    keywordsTravel
    keywordsFluids
    keywordsMotion
    keywordsFluctuations (Physics)
    keywordsCylinders AND Boundary layers
    treeJournal of Turbomachinery:;1993:;volume( 115 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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