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research-article

Numerical analysis of the effect of misaligned guide vanes on improving S-shaped characteristics for a pump-turbine

[+] Author and Article Information
Xiao Yexiang

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
xiaoyex@mail.tsinghua.edu.cn

Zhu Wei

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
ctrlzcj@126.com

Wang Zhengwei

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
wzw@mail.tsinghua.edu.cn

Zhang Jin

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Zhangjin119@mail.tsinghua.edu.cn

Ahn Soo-Hwang

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
ansh13@mails.tsinghua.edu.cn

Zeng Chongji

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
cengcj12@mails.tsinghua.edu.cn

Luo Yongyao

State Key Laboratory of Hydroscience and Engineering & Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
luoyy@mail.tsinghua.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4038077 History: Received August 24, 2016; Revised September 12, 2017

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.

Copyright (c) 2017 by ASME
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