Gas-liquid flow states and vibration characteristics of a double-blade centrifugal pump during self-priming process

WU Denghao1,ZHANG Ting1,ZHU Zhibing2,QIAN Heng3,REN Yun4,MOU Jiegang1

Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 1-6.

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PDF(1680 KB)
Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (8) : 1-6.

Gas-liquid flow states and vibration characteristics of a double-blade centrifugal pump during self-priming process

  • WU Denghao1,ZHANG Ting1,ZHU Zhibing2,QIAN Heng3,REN Yun4,MOU Jiegang1
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Abstract

The self-priming process of pump contains a complex gas-liquid two-phase flow structure, which induces vibration and noise and is not conducive to the stable operation of the pump. At present, the research on the pump self-priming process mainly focuses on the self-priming mechanism and the evolution of the gas-liquid flow states, and rarely involves the vibration characteristics of the self-priming process. In order to reveal the vibration induction mechanism of the self-priming process of centrifugal pump, the experimental research on the gas-liquid flow states and vibration characteristics of the pump is carried out by constructing the self-priming performance test rig with a double-blade centrifugal pump, and using high-speed photography technology and vibration testing technology. Meanwhile, five backflow holes in different positions are designed to study the effect of the position of backflow hole on self-priming performance and vibration performance. The results show that during the self-priming process, the drastic changes in the flow of gas and liquid inside the impeller aggravate the unstable radial loads of the impeller-rotor system, resulting in an increase in vibration intensity. During the self-priming process, the vibration excitation frequency is distributed in the medium frequency band of 700Hz-1200Hz, and the broadband vibration is the main contributor. There is a big bubble inside the impeller is observed. At the end of the self-priming process, the primary excitation frequency is the blade passing frequency, with the excitation frequency concentrated in the low frequency band of 25Hz-400Hz. The position of the backflow hole has a significant effect on the self-priming time, but less effect on the vibration intensity.

Key words

self-priming process / vibration characteristics / gas-liquid flow states / centrifugal pump

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WU Denghao1,ZHANG Ting1,ZHU Zhibing2,QIAN Heng3,REN Yun4,MOU Jiegang1. Gas-liquid flow states and vibration characteristics of a double-blade centrifugal pump during self-priming process[J]. Journal of Vibration and Shock, 2022, 41(8): 1-6

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