In order to analyze the effect of inclined trailing edge of blade on the exterior radiation noise of marine centrifugal pump,a 125CLLA-13 type marine centrifugal pump was chosen as the research object. The blade with inclined trailing edge and the blade without inclined trailing edge were used in the unsteady numerical simulation of the pump′s whole flow passage respectively. Then the pressure fluctuation of the wall of volute and leakage flow was obtained as the vector load.By loading the vector as the vibration source,the simulation of vibration based on modal response were conducted, and the vibration experiment of the pump without inclined trailing edge was done to verify the feasibility of simulation of noise of vibration. The further work was to simulate and analyze the exterior radiation noise of the model pump with different blade styles based on the acoustic-vibro coupling method.The results show that the changing trend of the sound power spectrum of the two blade styles is consistent at the same condition, but the LW of the blade with inclined trailing edge is obviously less than the other one. The maximum LW is at the BPF, and the design condition has the minimum value of LW at the BPF,the small flow rate condition has the maximum value of LW at the BPF.The exterior radiation noise of centrifugal pump has certain dipolarity and directivity,and the inclinded trailing edge of blade can reduced the sound pressure at the directivity field point.The minimum of sound pressure is at the design condition,and the maximum is at the small flow rate condition. Considering the terms of vibration and noise reduction,the blade with inclined trailing edge is superior to the blade without inclined trailing edge.The research results are useful for the vibration and noise reduction design of the marine centrifugal pump.
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