Experimental and numerical study on flow instability of pump-turbine under runaway conditions

被引：29

作者：

Chen, Zhenmu ^{[1
,2
]}

Jiang, Zhenyu ^{[2
]}

Chen, Shuai ^{[3
]}

Zhang, Wenwu ^{[4
]}

Zhu, Baoshan ^{[2
]}

机构：

[1] Wenzhou Univ, Coll Mech & Elect Engn, Wenzhou 325035, Zhejiang, Peoples R China

[2] Tsinghua Univ, Dept Energy & Power Engn, Beijing 100084, Peoples R China

[3] Chongqing Panlong Pumped Storage Co Ltd, Chongqing 401452, Peoples R China

[4] China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China

来源：

RENEWABLE ENERGY | 2023年 / 210卷

基金：

中国国家自然科学基金;

关键词：

Pump; -turbine; Runaway condition; Pressure fluctuation; Rotating stall; Vortex; Back flow; PRESSURE-FLUCTUATIONS; VANELESS SPACE;

D O I：

10.1016/j.renene.2023.04.075

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Pumped-storage power plants change operating conditions frequently, which seriously affects the safe operation of the unit operating under non-design conditions. In this study, the relationship between the flow structure with different guide vane openings (GVOs) of pump-turbine under the runaway condition is discussed. Moreover, the internal flow characteristics and the pressure fluctuation under the runaway condition are investigated. The dominant pressure fluctuation with 7fn is obtained in the vaneless and double-row cascade space of pump-turbine under runaway conditions. The pressure fluctuation of large GVOs is more serious than that of low GVOs in general. The pressure fluctuation amplitude exists to the most significant amount in the vaneless space of pumpturbine to compare with the other component. The rotating stall is observed with a large guide vane opening under the runaway conditions. Nevertheless, the rotating stall disappears with a small GVO of 6 mm.

引用

页码：335 / 345

页数：11

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