Numerical Investigation on the Cavitating Flow and the Cavitation-induced Noise in the Pump-jet Propeller

Document Type : Regular Article

Authors

1 National Research Center of Pump, Jiangsu University, Zhenjiang 212013, Jiangsu, China

2 School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

10.47176/jafm.18.2.2813

Abstract

The noise hazard posed by cavitation in pump-jet propellers is a significant concern during oceanic operations. This study evaluates the cavitation performance and associated noise characteristics of pump-jet propellers in underwater conditions, further examining the interplay between cavitation phenomena and noise radiation. Cavitation performance across varying advance coefficients was scrutinized using the k-ω SST turbulence model alongside the Zwart cavitation model. Employing Lighthill’s analogy method and bubble radiation theory, analyses of flow-induced noise and noise due to cavitation were conducted. The findings indicate an intensification of cavitation within the pump-jet with increased rotational speed and a reduction in cavitation number, aligning pressure and velocity distributions with observed cavitation patterns. Cavitation markedly elevates flow-induced noise levels, with noise under cavitation conditions found to be around 50 dB higher compared to non-cavitation conditions. Considering cavitation bubble radiation noise, the volumetric pulsations and their amplitudes in the pump-jet enlarge as the bubbles progress through initial growth to maturity. Predominantly, the noise levels from bubble volume pulsations occur within low to medium frequency ranges.

Keywords

Main Subjects

References

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Journal of Applied Fluid Mechanics
Volume 18, Issue 2 - Serial Number 94
February 2025
Pages 419-437

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History

  • Received: 27 April 2024
  • Revised: 30 June 2024
  • Accepted: 29 August 2024
  • Available online: 04 December 2024

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