Abstract:The complex three-dimensional turbulent flow field in a centrifugal water pump is numerically simulated considering torsional vibration of the shaft. The characteristic frequency and the frequency modulation phenomenon is investigated when the fluctuated-rotation-speed is considered. The results show that the amplitude of pressure fluctuation is bigger when the rotating-speed of shaft is unsteady, indicating that the speed fluctuations of impellers intensify the nonuniformity and instability of the whole flow … Show more
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