期刊
APPLIED SCIENCES-BASEL
卷 11, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/app11178180
关键词
flow instability; double-blade centrifugal pump; pressure pulsation; vibration; computational fluid dynamics (CFD)
类别
资金
- National Natural Science Foundation of China [51779226]
- Zhejiang Provincial Natural Science Foundation [LGG21E090002, LY21E060004, LGG21E090003]
- China Postdoctoral Science Foundation [2021M691383]
- Science and Technology Plan Project of State Administration for Market Regulation [2020MK192]
The study conducted a numerical investigation of a double-blade centrifugal pump, revealing the presence of large vortices at low flow rates and high vorticity near the blade trailing edge and volute tongue.
The flow instability of a double-blade centrifugal pump is more serious due to its special design feature with two blades and large flow passages. The dynamic instabilities and pressure pulsations can affect the pump performance and operating lifetime. In the present study, a numerical investigation of unsteady flow and time variation of pressure within a complete double-blade centrifugal pump was carried out. The time domain and frequency domain of pressure pulsations were extracted at 16 monitoring locations covering the important regions to analyze the internal flow instabilities of the pump model. The frequency spectra of pressure pulsations were decomposed into Strouhal number dependent functions. This led to the conclusion that the blade passing frequency (BPF) related vibrations are exclusively flow-induced. Large vortices were observed in the flow passages of the pump at low flow rate. It is noted that high vorticity magnitude occurred in the vicinities of the blade trailing edge and tongue of the volute, due to the rotor-stator interaction between impeller and volute.
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