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Influence of pump start-up mode on the stability of mixed-flow pumps

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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.

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Acknowledgments

This research is supported by the Science and Technology Innovation Fund of Hanjiang-to-Weihe River Valley Water Diversion Project Construction Co., Ltd., the Natural Science Projects of Shaanxi Education Department (No. 22JK0482), and the National Nature Science Foundation of China (Grant Nos. 51909212 and 52079108).

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Authors and Affiliations

  1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an, China

    Zhenbo Tang, Guojun Zhu & Jianjun Feng

  2. Hanjiang-to-weihe River Valley Water Diversion Project Construction Co., Ltd., Xi’an, China

    Yajun Wu, Kai Liu & Qiang Lu

Authors
  1. Zhenbo Tang
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  2. Guojun Zhu
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  3. Jianjun Feng
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  4. Yajun Wu
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  5. Kai Liu
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  6. Qiang Lu
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Corresponding author

Correspondence to Guojun Zhu.

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Guojun Zhu is an Associate Professor of the State Key Laboratory of Ecohydrau-lics in Northwest Arid Region, Xi’an University of Technology. He received his Ph.D. in Xi’an University of Tech-nology. His research interests include flow-induced vibration of hydraulic machine and the stability of hydraulic machine in transient process.

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Tang, Z., Zhu, G., Feng, J. et al. Influence of pump start-up mode on the stability of mixed-flow pumps. J Mech Sci Technol 37, 2949–2958 (2023). https://doi.org/10.1007/s12206-023-0521-7

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  • DOI: https://doi.org/10.1007/s12206-023-0521-7

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