Abstract：Effects of the flow rates on the vibration characteristics of a centrifugal pump were investigated using experimental methods and the flow rate three-dimensional spectrum graph methods. The test data at 5 test points under 7 flow rates, including small flow rates, high flow rates and the designed flow rate, were collected and analyzed. Results show that the relationship(V-Q)between vibration intensity(V)and flow rate(Q)is more complicated than that(η-Q)between efficiency(η)and flow rate(Q). Peaks of V-Q curves are related to fluid-induced vibration during the changing process of flow rate. There have significant difference between V-Q curve of axial vibration test and that of radial vibration test, while the latter basically have the same trend. Flow rate three-dimensional spectrum graph is able to reflect the changing process during the flow rate change. In addition, the spectrum characteristics of the fluid-induced vibration and the relationship between the best efficiency point(BEP)and vibration intensity were discussed.
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