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. 2022 Apr 1;7(14):12255-12267.
doi: 10.1021/acsomega.2c00684. eCollection 2022 Apr 12.

Research on Noise-Induced Characteristics of Unsteady Cavitation of a Jet Pump

Jian Gan  1 , Kang Zhang  1 , Deming Wang  1
Affiliations

Research on Noise-Induced Characteristics of Unsteady Cavitation of a Jet Pump

Jian Gan et al. ACS Omega. .

Abstract

The dynamic cavitation characteristics of normal-temperature water flowing through a transparent jet pump under different cavitation conditions were experimentally studied by adjusting the pressure ratio. The common results are presented at different pressure ratios, including the temporal and spatial changes of the pressure and noise, together with the visual observation of the cavitation unsteady behaviors using a high-speed camera. The analyses on the measured data and images reveal that the cavitation cloud is generated by periodic oscillations of the jet traveling pressure wave and the bubble traveling pressure wave. The oscillation of the two kinds of interface waves is caused by the collapse of the bubbles, which is the main mechanism of the bubble cloud shedding. As the pressure ratio increases, the maximum length of the jet cloud and bubble cloud linearly decreases, while their oscillation frequency increases gradually. Combined with the cavitation-cloud visualization data and noise frequency analysis, it is proposed that the strong impact between the jet traveling pressure wave and the bubble traveling pressure wave is the main cause of noise. Specially, the acoustic pressure reaches the maximum when the oscillation frequency of the jet traveling pressure wave is the same as that of the bubble traveling pressure wave. Also, the jet traveling pressure wave has a great influence on the migration of bubbles in the cavity. The results can provide guidance for the optimal operating condition in cavitation applications such as jet aerator and quantitative addition.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Schematic diagram of the internal structure of the cavitation jet device.
Figure 2
Figure 2
Schematic diagram of the experimental system.
Figure 3
Figure 3
Calibration and collection of the jet cloud and bubble cloud length.
Figure 4
Figure 4
Pearson correlation analysis at different noise sampling periods.
Figure 5
Figure 5
Oscillating law of jet clouds and the shedding of bubble clouds. Rapid growth phase of a jet cloud: (a–e). Slow growth phase of a jet cloud: (f–j). Rapid retreat phase of a jet cloud: (k–o). Slow retreat phase of a jet cloud: (p–t) (pi = 900 kPa, po = 200 kPa, and Qs = 0).
Figure 6
Figure 6
Growth and shedding of cavitation cloud vortices. Growth of cavitation cloud vortices: (a–e). Shedding of cavitation cloud vortices: (f–l) (pi = 700 kPa, po = 168 kPa, and Qs = 0).
Figure 7
Figure 7
Initial cavitation state in different parts of the diffuser inlet: (a–f).
Figure 8
Figure 8
Law of bubble movement in the cavitation cavity of the jet pump. (The pressure ratio of (a–d) is 0.3, 0.5, 0.7, and 0.77, respectively.)
Figure 9
Figure 9
Variation of suction port pressure and cavitation cloud length with time (pi = 1100 kPa and Qs = 0).
Figure 10
Figure 10
Variation of two kinds of interface positions with time. (a–c) Interface states of the jet traveling pressure wave and the bubble traveling pressure wave (pi = 900 kPa, po = 180 kPa, and Qs = 0).
Figure 11
Figure 11
Oscillation frequency corresponding to the jet cloud and bubble cloud under different pressure ratios. The inlet pressures of (a–c) are 700, 900, and 1100 kPa, respectively.
Figure 12
Figure 12
Variations of the maximum length of the jet cloud and bubble cloud with the pressure ratio. The inlet pressures of (a–c) are 700, 900, and 1100 kPa, respectively.
Figure 13
Figure 13
Variation of the acoustic pressure at different pressure ratios (pi = 900 kPa and Qs = 0).
Figure 14
Figure 14
Relationship between the oscillation frequency of the cavitation cloud and the acoustic pressure of cavitation noise. The pressure ratios of (a–e) are 0.28, 0.35, 0.4, 0.44, and 0.5, respectively (pi = 900 kPa and Qs = 0).
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