Pressure Fluctuation Characteristics Analysis of Centrifugal Pump as Turbine in Its Start-Up Process

In order to study pressure fluctuation characteristics of a centrifugal pump as turbine (PAT) in its start-up process, Fluent was used do numerical simulation the PAT process. Time and frequency domain analyses were performed on data acquired at different positions heads. The results show that large number low-pressure areas strong vortexes are formed within impeller initial time start-up. With increase rotating speed, rapidly decrease concentrated blade non-working face. amplitude is maximum instant; with it reduces volute spiral part. one rotation cycle consistent number, dominant 6 times rotational frequency. radial increases size volute. much more intensive than volute, occurs middle towards inner edge. head, same during