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    Experimental and Computational Investigation of Flow Instabilities in Turbine Rim Seals

    Source: Journal of Engineering for Gas Turbines and Power:;2019:;volume( 141 ):;issue: 001::page 11028
    Author:
    Horwood, Joshua T. M.
    ,
    Hualca, Fabian P.
    ,
    Scobie, James A.
    ,
    Wilson, Michael
    ,
    Sangan, Carl M.
    ,
    Lock, Gary D.
    DOI: 10.1115/1.4041115
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In high-pressure turbines, cool air is purged through rim seals at the periphery of wheel-spaces between the stator and rotor disks. The purge suppresses the ingress of hot gas from the annulus but superfluous use is inefficient. In this paper, the interaction between the ingress, purge, and mainstream flow is studied through comparisons of newly acquired experimental results alongside unsteady numerical simulations based on the DLR TRACE solver. New experimental measurements were taken from a one-and-a-half stage axial-turbine rig operating with engine-representative blade and vane geometries, and overlapping rim seals. Radial traverses using a miniature CO2 concentration probe quantified the penetration of ingress into the rim seal and the outer portion of the wheel-space. Unsteady pressure measurements from circumferentially positioned transducers on the stator disk identified distinct frequencies in the wheel-space, and the computations reveal these are associated with large-scale flow structures near the outer periphery rotating at just less than the disk speed. It is hypothesized that the physical origin of such phenomenon is driven by Kelvin–Helmholtz instabilities caused by the tangential shear between the annulus and egress flows, as also postulated by previous authors. The presence and intensity of these rotating structures are strongly dependent on the purge flow rate. While there is general qualitative agreement between experiment and computation, it is speculated that the underprediction by the computations of the measured levels of ingress is caused by deficiencies in the turbulence modeling.
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      Experimental and Computational Investigation of Flow Instabilities in Turbine Rim Seals

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4256172
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    contributor authorHorwood, Joshua T. M.
    contributor authorHualca, Fabian P.
    contributor authorScobie, James A.
    contributor authorWilson, Michael
    contributor authorSangan, Carl M.
    contributor authorLock, Gary D.
    date accessioned2019-03-17T10:31:36Z
    date available2019-03-17T10:31:36Z
    date copyright10/17/2018 12:00:00 AM
    date issued2019
    identifier issn0742-4795
    identifier othergtp_141_01_011028.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4256172
    description abstractIn high-pressure turbines, cool air is purged through rim seals at the periphery of wheel-spaces between the stator and rotor disks. The purge suppresses the ingress of hot gas from the annulus but superfluous use is inefficient. In this paper, the interaction between the ingress, purge, and mainstream flow is studied through comparisons of newly acquired experimental results alongside unsteady numerical simulations based on the DLR TRACE solver. New experimental measurements were taken from a one-and-a-half stage axial-turbine rig operating with engine-representative blade and vane geometries, and overlapping rim seals. Radial traverses using a miniature CO2 concentration probe quantified the penetration of ingress into the rim seal and the outer portion of the wheel-space. Unsteady pressure measurements from circumferentially positioned transducers on the stator disk identified distinct frequencies in the wheel-space, and the computations reveal these are associated with large-scale flow structures near the outer periphery rotating at just less than the disk speed. It is hypothesized that the physical origin of such phenomenon is driven by Kelvin–Helmholtz instabilities caused by the tangential shear between the annulus and egress flows, as also postulated by previous authors. The presence and intensity of these rotating structures are strongly dependent on the purge flow rate. While there is general qualitative agreement between experiment and computation, it is speculated that the underprediction by the computations of the measured levels of ingress is caused by deficiencies in the turbulence modeling.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental and Computational Investigation of Flow Instabilities in Turbine Rim Seals
    typeJournal Paper
    journal volume141
    journal issue1
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4041115
    journal fristpage11028
    journal lastpage011028-12
    treeJournal of Engineering for Gas Turbines and Power:;2019:;volume( 141 ):;issue: 001
    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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