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Study on the correlation between internal flow and sound pressure level energy characteristics of axial-flow pumps under different cavitation conditions

Author

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  • Jia, Xiaoqi
  • Yang, Yutong
  • Li, Yupeng
  • Cui, Baoling
  • Lin, Zhe

Abstract

The unstable flow within axial-flow pumps, the rotational speed, and the dynamic-static interaction between the impeller and guide vanes, generates complex turbulent noise. To explore the correlation between the internal flow state and the sound pressure level (SPL) energy in axial-flow pumps, this paper studies the acoustic characteristics of pumps under different flow conditions and cavitation states. The analysis indicates that unstable flows and vortices induced by cavitation significantly enhance dipole sound sources in the impeller and guide vane regions. Particularly during critical cavitation and severe cavitation stages, the overall SPL energy on the impeller and guide vane surfaces is higher. As cavitation progresses, regions with high SPL increase, but the maximum value remains relatively constant. The changes in sound sources caused by vortex stretching and uneven fluid kinetic energy distribution under different cavitation numbers were analyzed. It was observed that the instability of the flow field caused by vorticity and fluid kinetic energy leads to higher sound power generation.

Suggested Citation

  • Jia, Xiaoqi & Yang, Yutong & Li, Yupeng & Cui, Baoling & Lin, Zhe, 2025. "Study on the correlation between internal flow and sound pressure level energy characteristics of axial-flow pumps under different cavitation conditions," Energy, Elsevier, vol. 323(C).
    • Handle: RePEc:eee:energy:v:323:y:2025:i:c:s0360544225015129
    DOI: 10.1016/j.energy.2025.135870
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