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- Title
Influence of pump start-up mode on the stability of mixed-flow pumps.
- Authors
Tang, Zhenbo; Zhu, Guojun; Feng, Jianjun; Wu, Yajun; Liu, Kai; Lu, Qiang
- Abstract
To analyse the influence of the start-up mode on the stability of the mixed-flow pump, start-up experiments are performed. And the external characteristic parameters, pressure fluctuation and shaft vibration data are collected by a multi-channel synchronous signal acquisition system during start-up. These data are analyzed by the time-frequency analysis method and wavelet partial coherence analysis method. Results reveal a positive correlation between the impeller angular acceleration and the time change rate of external characteristic parameters. During the start-up process, the variation law of the external characteristic parameters similar with the law of impeller rotating speed rise. The amplitude of the shaft vibration has a positive correlation with the start-up acceleration of the impeller. The influence of guide vane pressure fluctuations on the shaft vibrations is greater within 0∼2 s after the start of the mixed-flow pump. With the strart-up time extension, the partial coherence between the shaft vibration and the pressure fluctuations in guide vane is enhanced in low frequency band, which increases the risk of flow-induced vibration of the pump shaft.
- Subjects
NEW business enterprises; ANGULAR acceleration; TIME-frequency analysis; IMPELLERS; WAVELETS (Mathematics); FREQUENCIES of oscillating systems
- Publication
Journal of Mechanical Science & Technology, 2023, Vol 37, Issue 6, p2949
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-023-0521-7