Abstract
The pressure fluctuations of high-speed centrifugal pumps are the hotspot in pump research. Pressure fluctuations is differ for different structural designs and flow structures. High-speed centrifugal pumps are usually designed to increase efficiency with an enlarged flow design at a low specific speed, which changes the structure of the pump. In order to analyze the pressure fluctuations of a high-speed centrifugal pump with an enlarged flow design, the pressure was measured, and the flow field of the pump was simulated with different flow rates. Through analysis, we found that pressure fluctuations varied periodically and was consistent with the blade frequency. The pressure fluctuations at the guide vane and the interference region were also closely related to the vortices at the impeller outlet, which changed differently at different flow rates. The results showed that the high-speed centrifugal pump with an enlarged design had better performance at a large flow rate. The results in this paper can provide reference for the design of a pump that should be designed with the enlarged flow method.
Highlights
There is little research on the pressure fluctuations of high-speed centrifugal pumps with an enlarged flow design. This is the first study on the pressure pulsation of high-speed centrifugal pumps with an enlarged flow design and its cause, and the differences with different flow rates
R, are the impeller outlet width and impeller outer radius after using the enlarged flow design method, respectively; H is the theoretical head of the pump; h is the total loss design method, respectively; H is the theoretical head of the pump; h is the total loss in the pump; and dR can be obtained according to Equation method, respectively; is the head of the hs is(4)
Three circumferential uniform pressure fluctuations sensors were installed in the flow field of the impeller and the guide vane, and three circumferential sensors were installed the impeller and the guide vane, and three circumferential sensors were installed in the field of the impeller and the guide vane, and three circumferential sensors were installed in the trailing edge of the inducer
Summary
Increases in the rotating speed can result in the flow field changing dramatically, which can make the pressure stronger. This poses a huge challenge for pump development. There is little research on the pressure fluctuations of high-speed centrifugal pumps with an enlarged flow design. This is the first study on the pressure pulsation of high-speed centrifugal pumps with an enlarged flow design and its cause, and the differences with different flow rates This can provide references for pump structure design, pressure pulsation suppression, operating conditions design, and fault diagnosis with the enlarged flow design
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