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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March 2018
Research-Article
Numerical Analysis of the Effect of Misaligned Guide Vanes on Improving S-Shaped Characteristics for a Pump-Turbine
Xiao Yexiang,
Xiao Yexiang
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xiaoyex@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xiaoyex@mail.tsinghua.edu.cn
Search for other works by this author on:
Zhu Wei,
Zhu Wei
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ctrlzcj@126.com
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ctrlzcj@126.com
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Wang Zhengwei,
Wang Zhengwei
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: wzw@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: wzw@mail.tsinghua.edu.cn
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Zhang Jin,
Zhang Jin
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: Zhangjin119@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: Zhangjin119@mail.tsinghua.edu.cn
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Ahn Soo-Hwang,
Ahn Soo-Hwang
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ansh13@mails.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ansh13@mails.tsinghua.edu.cn
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Zeng Chongji,
Zeng Chongji
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: cengcj12@mails.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: cengcj12@mails.tsinghua.edu.cn
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Luo Yongyao
Luo Yongyao
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: luoyy@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: luoyy@mail.tsinghua.edu.cn
Search for other works by this author on:
Xiao Yexiang
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xiaoyex@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: xiaoyex@mail.tsinghua.edu.cn
Zhu Wei
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ctrlzcj@126.com
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ctrlzcj@126.com
Wang Zhengwei
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: wzw@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: wzw@mail.tsinghua.edu.cn
Zhang Jin
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: Zhangjin119@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: Zhangjin119@mail.tsinghua.edu.cn
Ahn Soo-Hwang
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ansh13@mails.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: ansh13@mails.tsinghua.edu.cn
Zeng Chongji
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: cengcj12@mails.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: cengcj12@mails.tsinghua.edu.cn
Luo Yongyao
State Key Laboratory of Hydroscience
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: luoyy@mail.tsinghua.edu.cn
and Engineering,
Department of Thermal Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: luoyy@mail.tsinghua.edu.cn
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 24, 2016; final manuscript received September 12, 2017; published online October 24, 2017. Assoc. Editor: Bart van Esch.
J. Fluids Eng. Mar 2018, 140(3): 031102 (10 pages)
Published Online: October 24, 2017
Article history
Received:
August 24, 2016
Revised:
September 12, 2017
Citation
Yexiang, X., Wei, Z., Zhengwei, W., Jin, Z., Soo-Hwang, A., Chongji, Z., and Yongyao, L. (October 24, 2017). "Numerical Analysis of the Effect of Misaligned Guide Vanes on Improving S-Shaped Characteristics for a Pump-Turbine." ASME. J. Fluids Eng. March 2018; 140(3): 031102. https://doi.org/10.1115/1.4038077
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