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    About the Negative Direct Static Stiffness of Highly Eccentric Straight Annular Seals

    Source: Journal of Engineering for Gas Turbines and Power:;2015:;volume( 137 ):;issue: 008::page 82508
    Author:
    Arghir, Mihai
    ,
    Mariot, Antoine
    DOI: 10.1115/1.4029624
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Experimental results indicating negative direct static stiffness of highly eccentric straight gas annular seals were very recently presented by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201). This instability occurred at zero rotation speed and at high eccentricities. Up to then only gas annular seals with zero rotation speed, operating in centered position and with choked exit section were known as being susceptible of developing negative direct static stiffness. The seals and the working conditions presented by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201) had clearly no choked exit section. The present work advances a theoretical explanation of results reported by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201). The analysis is based on the numerical solution of the bulk flow equations of the flow in the annular seal. Theoretical results show a negative static stiffness at high eccentricities and zero rotation speeds. Other seal geometries and working conditions were tested and showed that the decrease of the direct static stiffness at high eccentricities and zero rotation speeds is a characteristic of all straight annular seals whether the fluid is compressible or not. Nevertheless with increasing rotation speed, the static stiffness becomes again positive and may increase with increasing eccentricity. The negative static stiffness is then limited to very specific working conditions: high eccentricities and zero rotation speed.
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      About the Negative Direct Static Stiffness of Highly Eccentric Straight Annular Seals

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    contributor authorArghir, Mihai
    contributor authorMariot, Antoine
    date accessioned2017-05-09T01:18:06Z
    date available2017-05-09T01:18:06Z
    date issued2015
    identifier issn1528-8919
    identifier othergtp_137_08_082508.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/158016
    description abstractExperimental results indicating negative direct static stiffness of highly eccentric straight gas annular seals were very recently presented by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201). This instability occurred at zero rotation speed and at high eccentricities. Up to then only gas annular seals with zero rotation speed, operating in centered position and with choked exit section were known as being susceptible of developing negative direct static stiffness. The seals and the working conditions presented by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201) had clearly no choked exit section. The present work advances a theoretical explanation of results reported by Childs and Arthur (2013, “Static Destabilizing Behavior for Gas Annular Seals at High Eccentricity Ratios,â€‌ ASME Paper No. GT201394201). The analysis is based on the numerical solution of the bulk flow equations of the flow in the annular seal. Theoretical results show a negative static stiffness at high eccentricities and zero rotation speeds. Other seal geometries and working conditions were tested and showed that the decrease of the direct static stiffness at high eccentricities and zero rotation speeds is a characteristic of all straight annular seals whether the fluid is compressible or not. Nevertheless with increasing rotation speed, the static stiffness becomes again positive and may increase with increasing eccentricity. The negative static stiffness is then limited to very specific working conditions: high eccentricities and zero rotation speed.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAbout the Negative Direct Static Stiffness of Highly Eccentric Straight Annular Seals
    typeJournal Paper
    journal volume137
    journal issue8
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4029624
    journal fristpage82508
    journal lastpage82508
    identifier eissn0742-4795
    treeJournal of Engineering for Gas Turbines and Power:;2015:;volume( 137 ):;issue: 008
    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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