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

被引：73

作者：

Yang, Jun ^{[1
]}

Pavesi, Giorgio ^{[2
]}

Liu, Xiaohua ^{[3
]}

Xie, Tian ^{[1
]}

Liu, Jun ^{[1
]}

机构：

[1] Univ Shanghai Sci & Technol, Sch Energy & Power Engn, Jungong Rd 516, Shanghai 200093, Peoples R China

[2] Univ Padua, Dept Ind Engn, Via Venezia 1, I-35131 Padua, Italy

[3] Shanghai Jiao Tong Univ, Sch Aeronaut & Astronaut, 500 Donchuan Rd, Shanghai 200240, Peoples R China

来源：

RENEWABLE ENERGY | 2018年 / 127卷

基金：

中国国家自然科学基金;

关键词：

Unsteady flow; Return channel; Pump mode; Hump instability; Pump-turbine; ENTROPY PRODUCTION ANALYSIS; GUIDE;

D O I：

10.1016/j.renene.2018.04.069

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：377 / 385

页数：9

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