Tests for rotating speed transient characteristics of centrifugal pump under cavitation

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (1) : 23-28.

LUO Yin, DONG Jian, HAN Yuejiang, YUAN Jianping

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Abstract

Transient rotating speed signal of centrifugal pump cavitation process was acquired through installing shaft encoder, and its characteristics and law under different levels of cavitation were further explored by means of time domain and frequency domain analysis. The analysis results showed that when cavitation just occurs in centrifugal pump, its rotating speed has the largest variation range, and fluctuation degree of rotating speed measured with standard deviation is also the largest, and the fluctuation degree of rotating speed under severe cavitation is higher than that without cavitation; in frequency domain, the natural frequency of the rotating speed of the centrifugal pump-motor system used in tests is 2.9 Hz; under cavitation condition, the main frequency of the pump rotating speed is also the shaft frequency, it does not change with the variation of flow rate and cavitation degree, but under the same flow rate, the amplitude of the main frequency is the highest during initial cavitation, followed by that during severe cavitation, and that is the minimum without cavitation; under different flow rates, the amplitude of the main frequency during initial cavitation firstly increases and then decreases with increase in flow rate, it reaches the maximum under the designed flow rate; in time-frequency domain, rotating speed characteristics are analyzed with wavelet analysis, its energy mainly concentrates in the range of 39-46.9 Hz under cavitation, and the rotating speed energy is the largest during initial cavitation.

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centrifugal pump / cavitation / transient rotating speed / rotating speed fluctuation / tests

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LUO Yin, DONG Jian, HAN Yuejiang, YUAN Jianping. Tests for rotating speed transient characteristics of centrifugal pump under cavitation[J]. Journal of Vibration and Shock, 2021, 40(1): 23-28

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