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    Numerical Study of Unsteady Cavitating Flow in an Inducer With Omega Vortex Identification

    Source: Journal of Fluids Engineering:;2022:;volume( 144 ):;issue: 009::page 91203-1
    Author:
    Yan, Longlong
    ,
    Gao, Bo
    ,
    Ni, Dan
    ,
    Zhang, Ning
    ,
    Zhou, Wenjie
    DOI: 10.1115/1.4053441
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: To accurately capture the behaviors of cavitation and reveal the unsteady cavitating flow mechanism, a condensate pump inducer is numerically analyzed in a separate numerical experiment with large eddy simulation (LES) at critical cavitation number σind,c under the design point. Based on the new Omega vortex identification method, the correlation between the flow structures and cavities is clearly illustrated. Besides, the pressure fluctuations around the inducer are analyzed. Special emphasis is put on the analysis of the interactions between the cavities, turbulent fluctuations, and vortical flow structures. The Omega vortex identification method could give an overall picture of the whole cavitating flow structures to present a clear correlation between the vortices and cavities. The results show that the shear cavitation dominates the cavitation characteristics under the design point. The pure rigid rotation region mainly concentrates at the edge of the cavities while the other sheet-like cavities near the casing walls are characterized by strong turbulence fluctuations. Besides, based on the analysis of the correlation between the cavities and flow structures, the rotating cavitation under the design point may mainly be attributed to the interaction between the tip leakage vortex cavitation and the next blade.
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      Numerical Study of Unsteady Cavitating Flow in an Inducer With Omega Vortex Identification

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4284881
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    contributor authorYan, Longlong
    contributor authorGao, Bo
    contributor authorNi, Dan
    contributor authorZhang, Ning
    contributor authorZhou, Wenjie
    date accessioned2022-05-08T09:13:50Z
    date available2022-05-08T09:13:50Z
    date copyright3/18/2022 12:00:00 AM
    date issued2022
    identifier issn0098-2202
    identifier otherfe_144_09_091203.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4284881
    description abstractTo accurately capture the behaviors of cavitation and reveal the unsteady cavitating flow mechanism, a condensate pump inducer is numerically analyzed in a separate numerical experiment with large eddy simulation (LES) at critical cavitation number σind,c under the design point. Based on the new Omega vortex identification method, the correlation between the flow structures and cavities is clearly illustrated. Besides, the pressure fluctuations around the inducer are analyzed. Special emphasis is put on the analysis of the interactions between the cavities, turbulent fluctuations, and vortical flow structures. The Omega vortex identification method could give an overall picture of the whole cavitating flow structures to present a clear correlation between the vortices and cavities. The results show that the shear cavitation dominates the cavitation characteristics under the design point. The pure rigid rotation region mainly concentrates at the edge of the cavities while the other sheet-like cavities near the casing walls are characterized by strong turbulence fluctuations. Besides, based on the analysis of the correlation between the cavities and flow structures, the rotating cavitation under the design point may mainly be attributed to the interaction between the tip leakage vortex cavitation and the next blade.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical Study of Unsteady Cavitating Flow in an Inducer With Omega Vortex Identification
    typeJournal Paper
    journal volume144
    journal issue9
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4053441
    journal fristpage91203-1
    journal lastpage91203-14
    page14
    treeJournal of Fluids Engineering:;2022:;volume( 144 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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