A test rig of the flow-induced noise based on passive four terminal network method of the centrifugal pump was built to collect sound signals in various operating conditions including different flowrates and cavitating status. The sound pressure level initially decreases when the flow rate is greater than 0.6Qd, reaches the minimum between Qd and 1.2Qd, and then subsequently increases with increasing flow rate. As the cavitation coefficient is reduced, the overall sound pressure level of flow-induced noise is gradually increased, and decreased after reaching a maximum. An optimum value as 15% of the impeller radius has been found between impeller and volute tongue in order to reach a minium sound level. Cutting the impeller diameter could significantly reduce the noise levels especially at the pump outlet and improve the cavitation performance of the model pump when the gap is less than the optimum.
Key words
centrifugal pumps /
flow-induced noise /
performance /
cavitation /
impeller-tongue gap
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