Analysis of Flow Noise Characteristics of Marine Vertical Centrifugal Pump
In order to reduce the noise of ships during navigation,the characteristics of internal flow noise of vertical centrifugal pumps for ships are studied.A computational fluid dynamics(CFD)numerical simulation method is used to calculate the unsteady flow field of a certain type of vertical centrifugal pump.The pulsating pressure characteristics at different positions is analyzed,and the accuracy of the flow field calculation results is verified through experimental means.Three different working conditions is used to extract the blade rotating dipole and volute fixed dipole acoustic source information obtained from the unsteady flow field calculation,and the internal flow noise is calculated and analyzed using LMS Virtual Lab.The research shows that the non-uniform jet-wake structure at the outlet of the impeller and the dynamic and static interference between the impeller and the diffuser are the main causes of the pulsating pressure in the impeller and volute of the vertical centrifugal pump.The internal noise is directly related to the pulsating pressure,and the frequency characteristics of the noise are consistent with the frequency characteristics of the pulsating pressure,mainly concentrated at the axial frequency,blade frequency,and harmonic frequencies.Both fixed dipole sound sources and rotating dipole sound sources make significant contributions to the flow noise in the vertical centrifugal pump.Compared with the rotating dipole sound source,the fixed dipole sound source has a relatively greater impact on the inlet and outlet noise.The research results can provide a reference for the anti-vibration and low-noise design of vertical centrifugal pumps used on ships.
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