Experimental study of instability characteristics in pump turbines

被引:12
|
作者
Ran, Hongjuan [1 ]
Luo, Xianwu [2 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Mech Engn, Shanghai, Peoples R China
[2] Tsinghua Univ, Dept Thermal Engn, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
Head-drop; high-Reynolds-number turbulence; rotating and swirling flows; separated flows; vortex dynamics; FLOW; IMPELLER;
D O I
10.1080/00221686.2017.1422193
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Experiments in a medium specific-speed pump turbine scaled model are performed to investigate instability characteristics in pump mode, namely the head-drop phenomena. Two different head-drops are captured on a pump performance curve. This paper presents the experimental investigations of the second head-drop phenomenon, with the flowrate varying from 0.6 to 0.7 times of the design flowrate in the scaled model. The low frequency signal of 0.14 times of the impeller rotating frequency in the draft tube is captured during the generation of the second head-drop. The alteration of the cavitation near the impeller inlet domain is also observed via a high-speed camera. These findings indicate that the complex vortices in the interaction area between the impeller inlet and the draft tube play a key role in the generation of the second head-drop phenomenon.
引用
收藏
页码:871 / 876
页数:6
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