Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry

Ning Zhang, Delin Li, Junxian Jiang, Bo Gao, Dan Ni, Anthony Akurugo Alubokin and Wenbin Zhang
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Ning Zhang: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Delin Li: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Junxian Jiang: Shanghai Marine Equipment Research Institute (SMERI), Shanghai 200031, China
Bo Gao: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Dan Ni: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Anthony Akurugo Alubokin: School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China
Wenbin Zhang: Shanghai Marine Equipment Research Institute (SMERI), Shanghai 200031, China

Energies, 2023, vol. 16, issue 7, 1-17

Abstract: Turbulent flow, mainly originating from the rotor-stator interaction (RSI), is closely associated with the normal and safe operation of the centrifugal pump. In the current research, to clarify turbulent flow in the centrifugal pump with a vaned diffuser, the non-intrusive LDA (Laser Doppler Anemometry) system is applied to measure velocity pulsation signals at different regions when the pump operates at various flow rates. Time and frequency domain analysis methods are combined to investigate the velocity signals, and the velocity distribution around the volute tongue region is reconstructed from twenty measuring points. Results show that the velocity spectrum is characterized by the discrete components at the blade passing frequency and its higher harmonics, and it is caused by the RSI between the impeller and the diffuser. For the points in the volute spiral and diffusion sections, due to the significantly reduced RSI effect, the velocity spectrum shows an evident difference from comparison with the points between the impeller and diffuser, and the blade passing frequency is not always the dominant frequency. The comparison of velocity amplitudes and RMS * (root mean square of velocity) values at different points proves that the measuring position and flow rate affect velocity pulsations. As observed from velocity distribution reconstructed by LDA signals, high velocity regions are developed downstream of the diffuser channel for all the measured flow rates.

Keywords: centrifugal pump; velocity signals; time-frequency analysis; LDA measurement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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