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research-article

Unsteady Flow and Pressure Pulsation Characteristics Analysis of Rotating Stall in Centrifugal Pumps under Off Design Conditions

[+] Author and Article Information
Zhao Xiaoran

State Key Laboratory of Hydroscience and Engineering and Department of Thermal Engineering, Tsinghua University, Beijing, China
zhaoxr14@mails.tsinghua.edu.cn

Xiao Yexiang

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

Wang Zhengwei

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

Luo Yongyao

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

Cao Lei

State Key Laboratory of Hydroscience and Engineering and Department of Thermal Engineering, Tsinghua University, Beijing, China
caolei613@126.com

1Corresponding author.

ASME doi:10.1115/1.4037973 History: Received July 20, 2016; Revised May 16, 2017

Abstract

Unsteady flow phenomena like rotating stall frequently occur in centrifugal pumps under off design conditions. Rotating stall could lead to flow instabilities and pressure pulsation, which affect the normal operation of pumps. The mechanism of rotating stall has not been sufficiently understood in previous researches. In this study, the impact of rotating stall in the impeller on centrifugal pump stability and pressure pulsation is numerically investigated. This paper aims to detect the unsteady flow characteristics inside the centrifugal pump by CFD technology, analyze pressure pulsations caused by rotating stall and explore the propagation mechanism of rotating stall. Unsteady numerical simulations were performed by ANSYS 16.0 to model the unsteady flow within the entire flow passage of a centrifugal pump under 0.4QBEP and 0.6QBEP working conditions. Through flow characteristics research, the generation and propagation of rotating stall are discovered. Flow separation appears near the leading edge of the pressure side and transforms into vortexes, which move along the passage. Meanwhile, the stall cells rotate circumferentially in the impeller. Additionally, frequencies and amplitudes of pressure pulsations related to rotating stall are investigated by spectrum analysis. The results detect a possible characteristic frequency of rotating stall and show that the interaction between stall cells and the volute tongue could have an influence on RSI.

Copyright (c) 2017 by ASME
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