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    A Numerical Study on the Influence of Hole Depth on the Static and Dynamic Performance of Hole Pattern Seals

    Source: Journal of Tribology:;2015:;volume( 137 ):;issue: 001::page 11702
    Author:
    Migliorini, Patrick J.
    ,
    Untaroiu, Alexandrina
    ,
    Wood, Houston G.
    DOI: 10.1115/1.4028604
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Annular seals serve an important role in the dynamics of turbomachinery by reducing leakage of a process fluid while also contributing potentially destabilizing forces to the rotor system. Holepattern seals have been the focus of many investigations, but recent experimental studies have shown that there are still many phenomena that require exploration. One such phenomenon is the influence of hole depth on the static and dynamic characteristics of the seal. In this paper, a hybrid computational fluid dynamics (CFD)/bulkflow method is employed to investigate the nonmonotonic relationship between hole depth and leakage shown in experimental measurements of a holepattern seal by Childs et al. (2014, “The Impact of Hole Depth on the Rotordynamic and Leakage Characteristics of HolePatternStator Gas Annular Seals,â€‌ ASME J. Eng. Gas Turbines Power, 136(4), p. 042501). Three hole depths (1.905 mm, 3.302 mm, and 6.604 mm) and three running speeds (10,200 rpm, 15,350 rpm, and 20,200 rpm) are considered. For the steadystate flow, the 3D ReynoldsAveragedNavierStokes (RANS) equations are solved with the kدµ turbulence model for a circumferentially periodic sector of the full seal geometry. The steadystate results are input into the firstorder equations of a bulkflow model to predict rotordynamic coefficients. Results of the hybrid method are compared to experimental data. CFD predicted leakage showed good agreement (within 5%) for the 3.302 mm and 6.604 mm hole depth configurations. For the 1.905 mm hole depth seal, agreement was within 17%. An additional set of calculations performed with the shear stress transport (SST) turbulence model produced worse agreement. Examination of streamlines along the seal show that the hole depth controls the shape of the vortex that forms in the hole, driving the resistance experienced by the jet flow in the clearance region. For the rotordynamic coefficients, good agreement is shown between predictions and experiment for most excitation frequencies.
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      A Numerical Study on the Influence of Hole Depth on the Static and Dynamic Performance of Hole Pattern Seals

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    contributor authorMigliorini, Patrick J.
    contributor authorUntaroiu, Alexandrina
    contributor authorWood, Houston G.
    date accessioned2017-05-09T01:24:00Z
    date available2017-05-09T01:24:00Z
    date issued2015
    identifier issn0742-4787
    identifier othertrib_137_01_011702.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/159776
    description abstractAnnular seals serve an important role in the dynamics of turbomachinery by reducing leakage of a process fluid while also contributing potentially destabilizing forces to the rotor system. Holepattern seals have been the focus of many investigations, but recent experimental studies have shown that there are still many phenomena that require exploration. One such phenomenon is the influence of hole depth on the static and dynamic characteristics of the seal. In this paper, a hybrid computational fluid dynamics (CFD)/bulkflow method is employed to investigate the nonmonotonic relationship between hole depth and leakage shown in experimental measurements of a holepattern seal by Childs et al. (2014, “The Impact of Hole Depth on the Rotordynamic and Leakage Characteristics of HolePatternStator Gas Annular Seals,â€‌ ASME J. Eng. Gas Turbines Power, 136(4), p. 042501). Three hole depths (1.905 mm, 3.302 mm, and 6.604 mm) and three running speeds (10,200 rpm, 15,350 rpm, and 20,200 rpm) are considered. For the steadystate flow, the 3D ReynoldsAveragedNavierStokes (RANS) equations are solved with the kدµ turbulence model for a circumferentially periodic sector of the full seal geometry. The steadystate results are input into the firstorder equations of a bulkflow model to predict rotordynamic coefficients. Results of the hybrid method are compared to experimental data. CFD predicted leakage showed good agreement (within 5%) for the 3.302 mm and 6.604 mm hole depth configurations. For the 1.905 mm hole depth seal, agreement was within 17%. An additional set of calculations performed with the shear stress transport (SST) turbulence model produced worse agreement. Examination of streamlines along the seal show that the hole depth controls the shape of the vortex that forms in the hole, driving the resistance experienced by the jet flow in the clearance region. For the rotordynamic coefficients, good agreement is shown between predictions and experiment for most excitation frequencies.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Numerical Study on the Influence of Hole Depth on the Static and Dynamic Performance of Hole Pattern Seals
    typeJournal Paper
    journal volume137
    journal issue1
    journal titleJournal of Tribology
    identifier doi10.1115/1.4028604
    journal fristpage11702
    journal lastpage11702
    identifier eissn1528-8897
    treeJournal of Tribology:;2015:;volume( 137 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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