Investigation on the effect of forward skew angle blade on the hump characteristic in a mixed flow pump using modified partially averaged Navier-Stokes model

RENEWABLE ENERGY

卷:170

Article

Ye, Weixiang^1,2  Ikuta, Akihiro²  Chen, Yining²  Miyagawa, Kazuyoshi³  Luo, Xianwu¹ 

[1] Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China

[2] Waseda Univ, Dept Appl Mech, Tokyo 1698555, Japan

[3] Waseda Univ, Dept Appl Mech & Aerosp Engn, Tokyo 1698555, Japan

关键词: Mixed flow pump;    Hump characteristic;    MSST PANS turbulence Model;    Forward skew angle blade;    Rotating stall;    Synchronous stall cell;   

DOI  :  10.1016/j.renene.2021.01.122

来源: Elsevier

【 摘 要 】

A mixed flow pump is regarded as an important power facility in the hydropower field for renewable energy. Pump impeller design shows a great attempt to alleviate the hump characteristic and suppress the severe pressure fluctuations as the mixed flow pumps operate under part-load conditions. In this respect, an advanced turbulence model, i.e., modified SST k -u partially averaged Navier-Stokes (MSST PANS) model, was adopted to numerically investigate the effect of forward skew angle blade on the hump characteristic using different impeller blades. Both experimental and numerical results indicate that the pump with forward skew angle blade shifts the hump region to the deeper part-load region. In the pump impeller with the forward skew angle blades, a synchronous stall cell is observed near the blade leading edge and near the hub side, while typical rotating stall cell evolution is observed in the conventional pump impeller. Analysis on the blade loading also indicates that under the unstable condition, the forward skew angle blade could switch the mid-loaded distribution to the fore-loaded distribution. Finally, the low frequency pressure fluctuations induced by the rotating stall cell evolution could be also eliminated successfully as the forward skew angle impeller blades are adopted. (c) 2021 Elsevier Ltd. All rights reserved.

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