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    Flow Similarity in the Rotor–Stator Interaction Affected Region in Prototype and Model Francis Pump Turbines in Generating Mode

    Source: Journal of Fluids Engineering:;2016:;volume( 138 ):;issue: 006::page 61201
    Author:
    Li, Zhongjie
    ,
    Wang, Zhengwei
    ,
    Wei, Xianzhu
    ,
    Qin, Daqing
    DOI: 10.1115/1.4032298
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Similarities of the flow in the rotor–stator interaction (RSI) affected region (stay vanes, guide vanes, and runner domain) in prototype and model Francis pumpturbines are analyzed using numerical simulations with special attention on the influence of Reynolds number. The ratios of characteristic length and velocity between the prototype and the model are 10.97 and 2.54; thus, the Reynolds numbers differ by about 28 times. Detailed flow analysis argues for higher partial load condition, Q = 0.8Qd, and severe partial load condition, Q = 0.45Qd. The flows in the distributor (spiral casing, stay vanes, and guide vanes domain) are wellbehaved for both conditions with no separation, presenting high level of similarity in both space and time domain. The flows in the runners are wellbehaved at higher partial load, Q = 0.8Qd, and present good flow similarity and weak Reynolds number effects between the model and the prototype. At severe partial load, Q = 0.45Qd, flow separation develops on the blade pressure sides and partially blocks the runner passages, showing prominent flow discrepancy and stronger Reynolds number effects between the two turbines. For the prototype flow of high Reynolds number, viscous effects have a minor role and less momentum is lost in the boundary layer. Therefore, the flow deceleration is less severe and the emergence of separation is restrained, presenting spatially delayed separation and a less disorganized flow pattern in the prototype. Validated by the model tests and onsite measurements, pressure fluctuations recorded in the vaneless space show that the relative fluctuation amplitudes in the model are slightly higher than those in the prototype. Resorting to dimensionless analytical equations and simulation results, the deviation in pressure fluctuations is found out to be influenced by Reynolds number effects. The research provides an improved understanding of Reynolds number effects on the flow discrepancy and pressure fluctuation difference in the RSIaffected region, which will facilitate better estimations of performance from scale model to prototype.
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      Flow Similarity in the Rotor–Stator Interaction Affected Region in Prototype and Model Francis Pump Turbines in Generating Mode

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    http://yetl.yabesh.ir/yetl1/handle/yetl/161374
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    contributor authorLi, Zhongjie
    contributor authorWang, Zhengwei
    contributor authorWei, Xianzhu
    contributor authorQin, Daqing
    date accessioned2017-05-09T01:29:36Z
    date available2017-05-09T01:29:36Z
    date issued2016
    identifier issn0098-2202
    identifier otherfe_138_06_061201.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/161374
    description abstractSimilarities of the flow in the rotor–stator interaction (RSI) affected region (stay vanes, guide vanes, and runner domain) in prototype and model Francis pumpturbines are analyzed using numerical simulations with special attention on the influence of Reynolds number. The ratios of characteristic length and velocity between the prototype and the model are 10.97 and 2.54; thus, the Reynolds numbers differ by about 28 times. Detailed flow analysis argues for higher partial load condition, Q = 0.8Qd, and severe partial load condition, Q = 0.45Qd. The flows in the distributor (spiral casing, stay vanes, and guide vanes domain) are wellbehaved for both conditions with no separation, presenting high level of similarity in both space and time domain. The flows in the runners are wellbehaved at higher partial load, Q = 0.8Qd, and present good flow similarity and weak Reynolds number effects between the model and the prototype. At severe partial load, Q = 0.45Qd, flow separation develops on the blade pressure sides and partially blocks the runner passages, showing prominent flow discrepancy and stronger Reynolds number effects between the two turbines. For the prototype flow of high Reynolds number, viscous effects have a minor role and less momentum is lost in the boundary layer. Therefore, the flow deceleration is less severe and the emergence of separation is restrained, presenting spatially delayed separation and a less disorganized flow pattern in the prototype. Validated by the model tests and onsite measurements, pressure fluctuations recorded in the vaneless space show that the relative fluctuation amplitudes in the model are slightly higher than those in the prototype. Resorting to dimensionless analytical equations and simulation results, the deviation in pressure fluctuations is found out to be influenced by Reynolds number effects. The research provides an improved understanding of Reynolds number effects on the flow discrepancy and pressure fluctuation difference in the RSIaffected region, which will facilitate better estimations of performance from scale model to prototype.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFlow Similarity in the Rotor–Stator Interaction Affected Region in Prototype and Model Francis Pump Turbines in Generating Mode
    typeJournal Paper
    journal volume138
    journal issue6
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4032298
    journal fristpage61201
    journal lastpage61201
    identifier eissn1528-901X
    treeJournal of Fluids Engineering:;2016:;volume( 138 ):;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
    yabeshDSpacePersian