Analysis of rotating stall cells in an impeller of a centrifugal pump

被引：0

作者：

Zhou, Peijian ^{[1
]}

Wang, Fujun ^{[1
,2
]}

Yao, Zhifeng ^{[1
,2
]}

机构：

[1] College of Water Resources and Civil Engineering, China Agricultural University, Beijing

[2] Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, Beijing

来源：

Shuili Xuebao/Journal of Hydraulic Engineering | 2015年 / 46卷 / 09期

关键词：

Centrifugal pump; Large eddy simulation; Low flowrate; Rotating stall;

D O I：

10.13243/j.cnki.slxb.20141556

中图分类号：

学科分类号：

摘要：

Rotating stall is an unsteady flow phenomenon that always causes instabilities and low efficiency in pumps. The purpose of this paper is to investigate the features of rotating stall flow in a centrifugal pump impeller based on a dynamic mixed nonlinear model (DMNM) combined with large eddy simulation method. The internal flow field and pressure fluctuation characteristics at the stall point are obtained. The simulation results show that the number of stall cells is 3 and the stall frequency is 2.44 Hz. Furthermore, the internal flow field of the impeller at different times during the stall cycles is presented. The stall cells are firstly occurred in the suction side of the blades. Then the area occupied by stall cells gradually increases until almost blocking the inlet section, forcing the flow turn to adjacent passage in the rotating direction of the impeller, which leads to a decreased angle of incidences on the blade. However, the other adjacent channel experiences an increased angle of incidences and the stall cell turns up. According to this rule, the stall cells propagate at 8% of rotor speed in the impeller. ©, 2015, Shuili Xuebao/Journal of Hydraulic Engineering. All right reserved.

引用

页码：1128 / 1134

页数：6

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