Numerical simulation for hydrodynamic noise of a multistage centrifugal pump under multi-working condition

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 50-55.

WANG Kai1LI Yu1 LIU Hou-lin1 XIA Chen1 LIU Zhong-cun2

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Abstract

Hydrodynamic noise excited by a dipole acoustic source in a five-stage diffuser centrifugal pump was studied with Lighthill acoustic analogy theory. The transient flow field inside the five-stage centrifugal pump was numerically simulated, and the dipole acoustic source on wall surface of all stages was extracted. The direct boundary element method was used to calculate the internal flow-induced noise in the pump. The pump’s vibration was calculated with the modal response method，vibration tests for the pump were also conducted. It was verified that the numerical prediction method for flow-induced noise in the pump has some certain feasibility. The results showed that with increase in flow rate, noise in the pump firstly increases, then decreases and increases again, the noise level is the minimum under the designed working condition; in the sound pressure frequency distribution, BPF2 and noise energy on its characteristic frequency increase with increase in flow rate, noise energy on a higher frequency range increases significantly; blade numbers of the first-stage impeller, another four stages’ impellers and positive guide vane have larger effects on flow induced noise, while blade number of the negative guide vane has a relatively smaller effect. The study results provided a reference for the design of low-noise multi-stage centrifugal pumps.

Key words

multi-stage centrifugal pump / multi-working condition / hydrodynamic noise / blade number / vibration

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WANG Kai1LI Yu1 LIU Hou-lin1 XIA Chen1 LIU Zhong-cun2. Numerical simulation for hydrodynamic noise of a multistage centrifugal pump under multi-working condition[J]. Journal of Vibration and Shock, 2018, 37(9): 50-55

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