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    Unsteady Flow Phenomena in Turbine Rim Seals

    Source: Journal of Engineering for Gas Turbines and Power:;2017:;volume( 139 ):;issue: 003::page 32501
    Author:
    Beard, Paul F.
    ,
    Gao, Feng
    ,
    Chana, Kam S.
    ,
    Chew, John
    DOI: 10.1115/1.4034452
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: While turbine rim sealing flows are an important aspect of turbomachinery design, affecting turbine aerodynamic performance and turbine disk temperatures, the present understanding and predictive capability for such flows is limited. The aim of the present study is to clarify the flow physics involved in rim sealing flows and to provide high-quality experimental data for use in evaluation of computational fluid dynamics (CFD) models. The seal considered is similar to a chute seal previously investigated by other workers, and the study focuses on the inherent unsteadiness of rim seal flows, rather than unsteadiness imposed by the rotating blades. Unsteady pressure measurements from radially and circumferentially distributed transducers are presented for flow in a rotor–stator disk cavity and the rim seal without imposed external flow. The test matrix covered ranges in rotational Reynolds number, Re∅, and nondimensional flow rate, Cw, of 2.2–3.0 × 106 and 0–3.5 × 103, respectively. Distinct frequencies are identified in the cavity flow, and detailed analysis of the pressure data associates these with large-scale flow structures rotating about the axis. This confirms the occurrence of such structures as predicted in previously published CFD studies and provides new data for detailed assessment of CFD models.
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      Unsteady Flow Phenomena in Turbine Rim Seals

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4233641
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    contributor authorBeard, Paul F.
    contributor authorGao, Feng
    contributor authorChana, Kam S.
    contributor authorChew, John
    date accessioned2017-11-25T07:15:43Z
    date available2017-11-25T07:15:43Z
    date copyright2016/27/9
    date issued2017
    identifier issn0742-4795
    identifier othergtp_139_03_032501.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4233641
    description abstractWhile turbine rim sealing flows are an important aspect of turbomachinery design, affecting turbine aerodynamic performance and turbine disk temperatures, the present understanding and predictive capability for such flows is limited. The aim of the present study is to clarify the flow physics involved in rim sealing flows and to provide high-quality experimental data for use in evaluation of computational fluid dynamics (CFD) models. The seal considered is similar to a chute seal previously investigated by other workers, and the study focuses on the inherent unsteadiness of rim seal flows, rather than unsteadiness imposed by the rotating blades. Unsteady pressure measurements from radially and circumferentially distributed transducers are presented for flow in a rotor–stator disk cavity and the rim seal without imposed external flow. The test matrix covered ranges in rotational Reynolds number, Re∅, and nondimensional flow rate, Cw, of 2.2–3.0 × 106 and 0–3.5 × 103, respectively. Distinct frequencies are identified in the cavity flow, and detailed analysis of the pressure data associates these with large-scale flow structures rotating about the axis. This confirms the occurrence of such structures as predicted in previously published CFD studies and provides new data for detailed assessment of CFD models.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleUnsteady Flow Phenomena in Turbine Rim Seals
    typeJournal Paper
    journal volume139
    journal issue3
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4034452
    journal fristpage32501
    journal lastpage032501-10
    treeJournal of Engineering for Gas Turbines and Power:;2017:;volume( 139 ):;issue: 003
    contenttypeFulltext
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