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    Prediction of Deswirled Radial Inflow in Rotating Cavities With Hysteresis

    Source: Journal of Turbomachinery:;2013:;volume( 135 ):;issue: 004::page 41025
    Author:
    May, David
    ,
    Chew, John W.
    ,
    Scanlon, Timothy J.
    DOI: 10.1115/1.4007741
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Deswirl nozzles are sometimes used in turbomachinery to reduce the pressure drop when air is drawn radially inwards through a rotating cavity. However, this can lead to nonunique steady state solutions with operating conditions achieved depending on how the steady point is approached. In the present study, a novel transient, 1D model of flow in a rotating cavity has been created. The model was validated for two distinct cases: a smooth rectangular cavity and an enginerepresentative case. The transient model reproduced experimentally observed hysteresis, discontinuity in operating characteristics, and regions where no steadystate solution could be found. In the case of the enginerepresentative rig, part of the flow characteristic could not be obtained in testing. This was determined to be due to the interaction of the negative resistance region of the vortex and the flowmodulating valve characteristic. Measures that allow the full capture of the flow characteristic in rig testing are identified. These results show that inclusion of transient rotating flow effects can be important in turbomachinery air systems modeling. To the authors' knowledge, this is the first model to capture these effects.
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      Prediction of Deswirled Radial Inflow in Rotating Cavities With Hysteresis

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    contributor authorMay, David
    contributor authorChew, John W.
    contributor authorScanlon, Timothy J.
    date accessioned2017-05-09T01:03:45Z
    date available2017-05-09T01:03:45Z
    date issued2013
    identifier issn0889-504X
    identifier otherturb_135_4_041025.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/153481
    description abstractDeswirl nozzles are sometimes used in turbomachinery to reduce the pressure drop when air is drawn radially inwards through a rotating cavity. However, this can lead to nonunique steady state solutions with operating conditions achieved depending on how the steady point is approached. In the present study, a novel transient, 1D model of flow in a rotating cavity has been created. The model was validated for two distinct cases: a smooth rectangular cavity and an enginerepresentative case. The transient model reproduced experimentally observed hysteresis, discontinuity in operating characteristics, and regions where no steadystate solution could be found. In the case of the enginerepresentative rig, part of the flow characteristic could not be obtained in testing. This was determined to be due to the interaction of the negative resistance region of the vortex and the flowmodulating valve characteristic. Measures that allow the full capture of the flow characteristic in rig testing are identified. These results show that inclusion of transient rotating flow effects can be important in turbomachinery air systems modeling. To the authors' knowledge, this is the first model to capture these effects.
    publisherThe American Society of Mechanical Engineers (ASME)
    titlePrediction of Deswirled Radial Inflow in Rotating Cavities With Hysteresis
    typeJournal Paper
    journal volume135
    journal issue4
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.4007741
    journal fristpage41025
    journal lastpage41025
    identifier eissn1528-8900
    treeJournal of Turbomachinery:;2013:;volume( 135 ):;issue: 004
    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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