Unsteady flow characteristics regarding hump instability in the first stage of a multistage pump-turbine in pump mode

Jun Yang, Giorgio Pavesi, Xiaohua Liu, Tian Xie and Jun Liu

Renewable Energy, 2018, vol. 127, issue C, 377-385

Abstract: This article reports the fluid-dynamical analyses of unsteady flow in the first stage of a multistage pump-turbine where hump instability occurs. This stage can be seen as a centrifugal pump with multistage guide vanes in pump mode. Experimental and numerical approaches are adopted to contribute the understanding of the highly complex flow regime inner the test pump. In the experimental test, both dynamic pressure measurement and flow visualization techniques are adopted. A commercial code with detached eddy simulation (DES) model is used to compute the flow regime. The frequency analysis indicates that two unsteady flow patterns with a constant frequency occur in the hump instability region. The numerical and experimental unsteady flow fields are analysed to study the fluid-dynamical features of these unsteady patterns, in order to investigate the origin and reveal their contributions to the hump instability.

Keywords: Unsteady flow; Return channel; Pump mode; Hump instability; Pump-turbine (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (12)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:127:y:2018:i:c:p:377-385

DOI: 10.1016/j.renene.2018.04.069

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