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Correlation analysis of cavitation-induced pressure pulsation and vibration in a bulb turbine

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Abstract

Cavitation is one of the main causes of deteriorating stability of bulb turbines. To enhance their stability, this study examines the effects of runner cavitation on draft tube pressure fluctuation and vibration in bulb turbine through experimental methods. With varying cavitation coefficients, a synchronous test system, including a high-speed camera, vibration acceleration sensors and pressure pulsation sensors, is applied to obtain cavitation images of the runner, vibration and internal fluid pressure pulsation data of the draft tube. The results show that the correlated component of pressure pulsation signals during the cavitation process is the synchronous pressure pulsation of 16fn With the development of cavitation, the amplitude of synchronous pressure pulsation increases first and then decreases. Cavitation enhances the high-frequency vibration on the wall of runner chamber. The root mean square (rms) of the vertical vibration component IMF3, the horizontal vibration components IMF2, IMF4 are linearly negatively correlated with the cavitation coefficient. The associated component between cavitation-induced vibration and pressure pulsation signal is 16fn and its harmonics. In the process of cavitation, pressure pulsation plays a leading role in vibration.

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Acknowledgment

This work was supported by the School-Enterprise Collaborative Innovation Fund for graduate students of Xi’an University of Technology.

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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, 710048, China

    Tian-shu Li, Jian-jun Feng, Guo-jun Zhu, Yun-zhe Li & Xing-qi Luo

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  1. Tian-shu Li
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  2. Jian-jun Feng
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  3. Guo-jun Zhu
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  4. Yun-zhe Li
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  5. Xing-qi Luo
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Correspondence to Jian-jun Feng.

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Conflict of interest: The authors declare that they have no conflict of interest. Jian-jun Feng, Xing-qi Luo are editorial board members for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.

Ethical approval: This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent: Informed consent was obtained from all individual participants included in the study.

Additional information

Project supported by the National Natural Science Foundation of China (Grant No. 52079108).

Biography: Tian-shu Li (1999-), Male, Master Candidate

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Li, Ts., Feng, Jj., Zhu, Gj. et al. Correlation analysis of cavitation-induced pressure pulsation and vibration in a bulb turbine. J Hydrodyn 35, 1052–1063 (2023). https://doi.org/10.1007/s42241-024-0084-9

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  • DOI: https://doi.org/10.1007/s42241-024-0084-9

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