Pipeline noise increasingly becomes the main obstacle to reduce ship vibration and noise level. Pump equipment are the main source of pipeline noise in various ships, however, there is strictly limitation in lowering flow-induced noise level of a traditional centrifugal pump in which there is a high rotational speed and a strong rotor-stator interaction. Fortunately, the rotary lobe pump has a great advantage in reducing flow-induced noise. 2D and 3D straight and twisted lobes model pumps were built based on the working principle of rotary pump, and the flow field and pressure fluctuation characteristics in those pumps were analyzed by using CFD dynamic mesh method. The results show the flow rate has a linear relation with pump rotational speed but exhibits a periodic property. The pressure is distributed uniformly in the pumps and there is no obvious pressure gradient in the flow field. Howe-ver, there are vortex zones and flow separation phenomenon in the gap between two lobes and in the inlet and outlet of the pumps. The pressure fluctuation can be effectively reduced with increasing number of lobes and by using a spiral wing. Unfortunately, the pressure fluctuation still augments rapidly with increasing rotational speed.
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