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    Simulations and Measurements of Pressure Oscillations Caused by Vortex Ropes

    Source: Journal of Fluids Engineering:;2006:;volume( 128 ):;issue: 004::page 649
    Author:
    Zhengwei Wang
    ,
    Lingjiu Zhou
    DOI: 10.1115/1.2201631
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Pressure oscillations caused by vortex rope were measured in the draft tube of a prototype Francis turbine. The three-dimensional, unsteady Reynolds-averaged Navier-Stokes equations with the RNG κ−ϵ turbulence model were solved to model the flow within the entire flow path of the prototype hydraulic unit including the guide vanes, the runner, and the draft tube. The model was able to predict the pressure fluctuations that occur when operating at 67–83% of the optimum opening. The calculated frequencies and amplitudes of the oscillation show reasonable agreement with the experiment data. However, the results at 50% opening were not satisfactory. Pressure oscillations on the runner blades were found to be related to the precession of vortex ropes which caused pressure on the blades to fluctuate with frequencies of −fn+fd (fn is the rotational frequency and fd is vortex procession frequency). The peak-to-peak amplitudes of the pressure oscillations on the blades at the lower load conditions (67% opening) were higher than at higher load conditions (83% opening). Fluctuations on the suction side tended to be stronger than on the pressure side.
    keyword(s): Oscillations , Pressure , Fluctuations (Physics) , Vortices , Ropes , Measurement , Flow (Dynamics) AND Frequency ,
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      Simulations and Measurements of Pressure Oscillations Caused by Vortex Ropes

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/133898
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    • Journal of Fluids Engineering

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    contributor authorZhengwei Wang
    contributor authorLingjiu Zhou
    date accessioned2017-05-09T00:20:15Z
    date available2017-05-09T00:20:15Z
    date copyrightJuly, 2006
    date issued2006
    identifier issn0098-2202
    identifier otherJFEGA4-27219#649_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/133898
    description abstractPressure oscillations caused by vortex rope were measured in the draft tube of a prototype Francis turbine. The three-dimensional, unsteady Reynolds-averaged Navier-Stokes equations with the RNG κ−ϵ turbulence model were solved to model the flow within the entire flow path of the prototype hydraulic unit including the guide vanes, the runner, and the draft tube. The model was able to predict the pressure fluctuations that occur when operating at 67–83% of the optimum opening. The calculated frequencies and amplitudes of the oscillation show reasonable agreement with the experiment data. However, the results at 50% opening were not satisfactory. Pressure oscillations on the runner blades were found to be related to the precession of vortex ropes which caused pressure on the blades to fluctuate with frequencies of −fn+fd (fn is the rotational frequency and fd is vortex procession frequency). The peak-to-peak amplitudes of the pressure oscillations on the blades at the lower load conditions (67% opening) were higher than at higher load conditions (83% opening). Fluctuations on the suction side tended to be stronger than on the pressure side.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleSimulations and Measurements of Pressure Oscillations Caused by Vortex Ropes
    typeJournal Paper
    journal volume128
    journal issue4
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2201631
    journal fristpage649
    journal lastpage655
    identifier eissn1528-901X
    keywordsOscillations
    keywordsPressure
    keywordsFluctuations (Physics)
    keywordsVortices
    keywordsRopes
    keywordsMeasurement
    keywordsFlow (Dynamics) AND Frequency
    treeJournal of Fluids Engineering:;2006:;volume( 128 ):;issue: 004
    contenttypeFulltext
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