Abstract
The pressure fluctuations were measured in the impellers of centrifugal pumps with vaned diffusers. Frequency analysis shows that N (rotor speed)×Zd (number of diffuser blades) component and its harmonics are dominant in the fluctuations. The amplitudes of the NZd component have their minimum value when the flow coefficient is close to the value for shockless entry into the diffuser vanes. The phase angles of the NZd component at most measuring points are determined only by the circumferential position of the measuring points when the flow coefficient is small. The maximum amplitude of the NZd component throughout the experiments was 4% of the dynamic pressure defined by the peripheral velocity of the impellers.
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