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    Flow and Heat Transfer Mechanisms in a Rotating Compressor Cavity Under Centrifugal Buoyancy-Driven Convection

    Source: Journal of Engineering for Gas Turbines and Power:;2022:;volume( 144 ):;issue: 005::page 51010-1
    Author:
    Gao, Feng
    ,
    Chew, John W.
    DOI: 10.1115/1.4052649
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper presents a systematic study of flow and heat transfer mechanisms in a compressor disk cavity with an axial throughflow under centrifugal buoyancy-driven convection, comparing with previously published experimental data. Wall-modeled large-eddy simulations (WMLES) are conducted for six operating conditions, covering a range of rotational Reynolds number (3.2×105−2.2×106), buoyancy parameter (0.11–0.26), and Rossby number (0.4–0.8). Numerical accuracy and computational efficiency of the simulations are considered. Wall heat transfer predictions are compared with measured data with a good level of agreement. A constant rothalpy core occurs at high Eckert number, appearing to reduce the driving buoyancy force. The flow in the cavity is turbulent with unsteady laminar Ekman layers observed on both disks except in the bore flow affected region on the downstream disk cob. The shroud heat transfer Nusselt number–Rayleigh number scaling agrees with that of natural convection under gravity for high Rayleigh numbers. Disk heat transfer is dominated by conduction across unsteady Ekman layers, except on the downstream disk cob. The disk bore heat transfer is close to a pipe flow forced convection correlation. The unsteady flow structure is investigated showing strong unsteadiness in the cavity that extends into the axial throughflow.
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      Flow and Heat Transfer Mechanisms in a Rotating Compressor Cavity Under Centrifugal Buoyancy-Driven Convection

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4285020
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    contributor authorGao, Feng
    contributor authorChew, John W.
    date accessioned2022-05-08T09:20:40Z
    date available2022-05-08T09:20:40Z
    date copyright2/21/2022 12:00:00 AM
    date issued2022
    identifier issn0742-4795
    identifier othergtp_144_05_051010.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4285020
    description abstractThis paper presents a systematic study of flow and heat transfer mechanisms in a compressor disk cavity with an axial throughflow under centrifugal buoyancy-driven convection, comparing with previously published experimental data. Wall-modeled large-eddy simulations (WMLES) are conducted for six operating conditions, covering a range of rotational Reynolds number (3.2×105−2.2×106), buoyancy parameter (0.11–0.26), and Rossby number (0.4–0.8). Numerical accuracy and computational efficiency of the simulations are considered. Wall heat transfer predictions are compared with measured data with a good level of agreement. A constant rothalpy core occurs at high Eckert number, appearing to reduce the driving buoyancy force. The flow in the cavity is turbulent with unsteady laminar Ekman layers observed on both disks except in the bore flow affected region on the downstream disk cob. The shroud heat transfer Nusselt number–Rayleigh number scaling agrees with that of natural convection under gravity for high Rayleigh numbers. Disk heat transfer is dominated by conduction across unsteady Ekman layers, except on the downstream disk cob. The disk bore heat transfer is close to a pipe flow forced convection correlation. The unsteady flow structure is investigated showing strong unsteadiness in the cavity that extends into the axial throughflow.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFlow and Heat Transfer Mechanisms in a Rotating Compressor Cavity Under Centrifugal Buoyancy-Driven Convection
    typeJournal Paper
    journal volume144
    journal issue5
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4052649
    journal fristpage51010-1
    journal lastpage51010-11
    page11
    treeJournal of Engineering for Gas Turbines and Power:;2022:;volume( 144 ):;issue: 005
    contenttypeFulltext
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