In the present work, the effect of radial gap between impeller and diffuser on vibration and noise in a centrifugal pump under different flow conditions is examined, Three radial gaps are considered. For each radial gap, the flow is varied by the throttling of delivery and suction valve, respectively. For every case of radial gap and suction valve, respectively. For every case of radial gap and flow condition, the flow is varied by the throttling of delivery and suction valve, the overall level of vibration velocity and sound pressure is measured. Frequency analysis of these parameters is also carried out. At maximum radial gap, the overall level of vibration and noise are minimum. In the vibration spectra, frequency components are distinct. Depending upon the radial gap, impeller or diffuser vane pass component generally dominates the spectra. There is a good correlation between vibration and noise. The results of the experiments show that by increasing the radial gap between impeller and diffuser, considerable reduction in vibration and noise has been acheived, without sacrificing too much on the performance of the pump.
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