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    Performance of Adaptive Lubricants in a Hybrid Journal Bearing Operating Under Fully Saturated Conditions

    Source: Journal of Engineering for Gas Turbines and Power:;2018:;volume( 140 ):;issue: 006::page 62504
    Author:
    Chien, Ssu-Ying
    ,
    Cramer, M. S.
    ,
    Fu, Gen
    ,
    Untaroiu, Alexandrina
    DOI: 10.1115/1.4038551
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Adaptive lubricants involve binary mixture of synthetic oil and dissolved carbon dioxide (CO2). Unlike conventional lubricant oils, the lubricant viscosity not only varies with the temperature within the bearing but also can be directly adjusted through the CO2 concentration in the system. In this study, we consider the synthetic oil to be fully saturated by CO2 to investigate the maximum impacts of adaptive lubricants on the performance of a hybrid journal bearing. The adaptive lubricant analyzed for this study was the polyalkylene glycol (PAG) oil with low concentration of CO2 (<30%). A three-dimensional (3D) computational fluid dynamic (CFD) model of the bearing was developed and validated against the experimental data. The mixture composition and the resultant mixture viscosity were calculated as a function of pressure and temperature using empirical equations. The simulation results revealed that the viscosity distribution within the PAG/CO2-lubricated bearing is determined primarily by the pressure at the low operating speed. When the speed becomes higher, it is the temperature effect that dominates the viscosity distribution within the bearing. Moreover, the PAG/CO2-lubricated bearing can reduce up to 12.8% power loss than the PAG-lubricated bearing due to the low viscosity of PAG/CO2 mixture. More importantly, we have found that the PAG/CO2 can enhance the load capacity up to 19.6% when the bearing is operating at high-speed conditions.
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      Performance of Adaptive Lubricants in a Hybrid Journal Bearing Operating Under Fully Saturated Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4251094
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorChien, Ssu-Ying
    contributor authorCramer, M. S.
    contributor authorFu, Gen
    contributor authorUntaroiu, Alexandrina
    date accessioned2019-02-28T10:57:03Z
    date available2019-02-28T10:57:03Z
    date copyright2/21/2018 12:00:00 AM
    date issued2018
    identifier issn0742-4795
    identifier othergtp_140_06_062504.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4251094
    description abstractAdaptive lubricants involve binary mixture of synthetic oil and dissolved carbon dioxide (CO2). Unlike conventional lubricant oils, the lubricant viscosity not only varies with the temperature within the bearing but also can be directly adjusted through the CO2 concentration in the system. In this study, we consider the synthetic oil to be fully saturated by CO2 to investigate the maximum impacts of adaptive lubricants on the performance of a hybrid journal bearing. The adaptive lubricant analyzed for this study was the polyalkylene glycol (PAG) oil with low concentration of CO2 (<30%). A three-dimensional (3D) computational fluid dynamic (CFD) model of the bearing was developed and validated against the experimental data. The mixture composition and the resultant mixture viscosity were calculated as a function of pressure and temperature using empirical equations. The simulation results revealed that the viscosity distribution within the PAG/CO2-lubricated bearing is determined primarily by the pressure at the low operating speed. When the speed becomes higher, it is the temperature effect that dominates the viscosity distribution within the bearing. Moreover, the PAG/CO2-lubricated bearing can reduce up to 12.8% power loss than the PAG-lubricated bearing due to the low viscosity of PAG/CO2 mixture. More importantly, we have found that the PAG/CO2 can enhance the load capacity up to 19.6% when the bearing is operating at high-speed conditions.
    publisherThe American Society of Mechanical Engineers (ASME)
    titlePerformance of Adaptive Lubricants in a Hybrid Journal Bearing Operating Under Fully Saturated Conditions
    typeJournal Paper
    journal volume140
    journal issue6
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4038551
    journal fristpage62504
    journal lastpage062504-7
    treeJournal of Engineering for Gas Turbines and Power:;2018:;volume( 140 ):;issue: 006
    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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