Effect of inclined trailing edge of blade on vibration and hydrodynamic noise of marine centrifugal pump

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (12) : 195-200.

HUANG Hao-qin LIU Hou-lin WANG Yong JIANG Ling-lin SHAO Chang

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Abstract

In order to analyze the effect of inclined trailing edge of blade on the vibration and hydrodynamic noise of marine centrifugal pump,a 125clla-13 type marine centrifugal pump was chosen as the research object.Firstly the blade with inclined trailing edge and the blade without inclined trailing edge were used to the unsteady numerical simulation of the pump’s whole flow passage respectively, and 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 and dipole source,the simulation of vibration based on modal response and simulation of the hydrodynamic noise based on BEM were conducted.Also the vibration experiment of the pump without inclined trailing edge was done,and it was verified by the vibration experiment that the simulation of NVH had certain feasibility.The further work was to analyze the simulation results of the two blade styles,the results show that the vibration acceleration of the blade with inclined trailing edge is less than the other one on the whole, the changing trend of the sound power of the two blade styles along with the conditions is consistent,the minimum of sound power is at the design condition,and the maximum is at the larger flow condition.All the sound power and the SPL of the blade with inclined trailing edge are obviously less than the other one,and the decreasing amplitude of the SPL is generally on the rise from APF to 4BPF.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.

Key words

marine centrifugal pump / inclined trailing edge;noise and vibration;numerical simulation / dipole source

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HUANG Hao-qin LIU Hou-lin WANG Yong JIANG Ling-lin SHAO Chang. Effect of inclined trailing edge of blade on vibration and hydrodynamic noise of marine centrifugal pump[J]. Journal of Vibration and Shock, 2015, 34(12): 195-200

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