Demonstrates frequency analysis of cavitation noise in centrifugal pumps, indicating design modifications can affect performance and noise levels.
Cavitation occurring in a centrifugal pump is a known cause of various detrimental effects. For example, to decrease suction performance, vibration in piping systems, increased noise and damage to components. This study aimed to reduce cavitation noise without degrading pump suction performance. We carried out suction performance tests and noise measurement. We used fan-type inducer which is low solidity, applied leading edge corrugation bioinspired humpback whale pectoral fins and sweep shapes that have demonstrated noise reduction. From these experiment results, we observed that applying wave and sweep inducer improved suction performance. However, sound pressure level unexpectedly worsened. A focused analysis on the frequency characteristics revealed that this noise increase was primarily due to the peak of sound pressure level below 5 kHz and above 10 kHz. This detailed frequency analysis helped us identify the specific causes for the observed differences in sound pressure level when applying this leading edge modification.
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NUKATSUKA et al. (2025) studied this question.
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