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    Numerical Analysis of the Effect of Misaligned Guide Vanes on Improving S-Shaped Characteristics for a Pump-Turbine

    Source: Journal of Fluids Engineering:;2018:;volume( 140 ):;issue: 003::page 31102
    Author:
    Yexiang, Xiao
    ,
    Wei, Zhu
    ,
    Zhengwei, Wang
    ,
    Jin, Zhang
    ,
    Soo-Hwang, Ahn
    ,
    Chongji, Zeng
    ,
    Yongyao, Luo
    DOI: 10.1115/1.4038077
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The S-shaped characteristic curves in pump-turbines complicate synchronization with the electrical grid and affect system safety. Misaligned guide vanes (MGVs) are one of the most effective solutions to avoid S-shaped characteristics. The internal flow mechanism with the MGV for improving S-shaped characteristics was studied by numerical analysis. Six operating conditions were modeled in the S-shaped region. Four guide vanes were arranged as the MGVs to qualitatively and quantitatively analyze the flow behavior. The internal flow was quite complex at the four operating points without the MGV; here, the attack angle and the flow behavior had no obvious difference at each vane. For the similar conditions with MGVs, attack angles and internal flow fields varied clearly at each vane, especially in the vaneless region and in the runner blade passages. For the same discharge rates, total openings, and rotating speeds, the internal flows were quite different between with and without the MGVs. The MGVs disrupt the high-speed circumferential water ring (appreciably faster compared to the main flow) in the vaneless region and maintain operation with higher unit speeds. Consequently, the unit speed is larger at the same unit discharge in the S-shaped region. Therefore, the MGV method can reduce S-shaped characteristics.
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      Numerical Analysis of the Effect of Misaligned Guide Vanes on Improving S-Shaped Characteristics for a Pump-Turbine

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4251623
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    • Journal of Fluids Engineering

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    contributor authorYexiang, Xiao
    contributor authorWei, Zhu
    contributor authorZhengwei, Wang
    contributor authorJin, Zhang
    contributor authorSoo-Hwang, Ahn
    contributor authorChongji, Zeng
    contributor authorYongyao, Luo
    date accessioned2019-02-28T11:00:16Z
    date available2019-02-28T11:00:16Z
    date copyright10/24/2017 12:00:00 AM
    date issued2018
    identifier issn0098-2202
    identifier otherfe_140_03_031102.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4251623
    description abstractThe S-shaped characteristic curves in pump-turbines complicate synchronization with the electrical grid and affect system safety. Misaligned guide vanes (MGVs) are one of the most effective solutions to avoid S-shaped characteristics. The internal flow mechanism with the MGV for improving S-shaped characteristics was studied by numerical analysis. Six operating conditions were modeled in the S-shaped region. Four guide vanes were arranged as the MGVs to qualitatively and quantitatively analyze the flow behavior. The internal flow was quite complex at the four operating points without the MGV; here, the attack angle and the flow behavior had no obvious difference at each vane. For the similar conditions with MGVs, attack angles and internal flow fields varied clearly at each vane, especially in the vaneless region and in the runner blade passages. For the same discharge rates, total openings, and rotating speeds, the internal flows were quite different between with and without the MGVs. The MGVs disrupt the high-speed circumferential water ring (appreciably faster compared to the main flow) in the vaneless region and maintain operation with higher unit speeds. Consequently, the unit speed is larger at the same unit discharge in the S-shaped region. Therefore, the MGV method can reduce S-shaped characteristics.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical Analysis of the Effect of Misaligned Guide Vanes on Improving S-Shaped Characteristics for a Pump-Turbine
    typeJournal Paper
    journal volume140
    journal issue3
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4038077
    journal fristpage31102
    journal lastpage031102-10
    treeJournal of Fluids Engineering:;2018:;volume( 140 ):;issue: 003
    contenttypeFulltext
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