Experimental Characterization of a Pump-Turbine in Pump Mode at Hump Instability Region

被引：80
|
作者：
Yang, J. [1 ]
Pavesi, G. [2 ]
Yuan, S. [1 ]
Cavazzini, G. [2 ]
Ardizzon, G. [2 ]
机构：
[1] Jiangsu Univ, Natl Res Ctr Pumps, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Univ Padua, Dept Ind Engn, Via Venezia 1, I-35131 Padua, Italy
来源：
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 2015年 / 137卷 / 05期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
pump-turbine; hump-instability region; pressure measurement; high-speed flow visualization; rotating stall; ROTOR-STATOR INTERACTION; CENTRIFUGAL PUMP; FLOW; VIBRATION; IMPELLER;
D O I：
10.1115/1.4029572
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The unsteady phenomena of a low specific speed pump-turbine operating in pump mode were characterized by dynamic pressure measurements and high-speed flow visualization of injected air bubbles. Analyses were carried out on the pressure signals both in frequency and time-frequency domains and by bispectral protocol. The results obtained by high-speed camera were used to reveal the flow pattern in the diffuser and return vanes channels The unsteady structure identified in the return vane channel appeared both at full and part load condition. Furthermore, a rotating stall structure was found and characterized in the diffuser when the pump operated at part load. The characteristics of these two unsteady structures are described in the paper.
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收藏
页数：11
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