Numerical research on the effect of impeller clocking position on vibration of multistage centrifugal pumps

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (24) : 117-122.

Tan Minggao Dai Hanwei Liu Houlin Ding Jian Ding Rong

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Abstract

In order to study the impeller clocking position in multistage centrifugal pumps on the fluid-induced vibration, the structural dynamic response of the pump casing under the fluid excitation was analyzed based on the combination of CFD and FEM methods. The simulation results indicate that the impeller clocking position has no influence on the frequency, amplitude and phase of the pressure pulsations in the first stage. The frequency of the pressure fluctuation in the second stage is also independent of the clocking position, and the amplitude increases slightly with the clocking position variation; however, the phase changes significantly with the increase of clocking position. When the clocking angle is just half the blade angle, the phase of the pressure pulsation in the second stage is shifted by 90 degrees comparing with the pressure fluctuation in the first stage. As such, the direction of the pressure pulsation in the second stage is opposite to the pressure in the first stage. This leads to a reduction of axial flow excitation and an opposite axial vibration amount, making the overall vibration levels drop obviously.

Key words

multistage centrifugal pump / clocking effect / pressure pulsation / vibration

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Tan Minggao Dai Hanwei Liu Houlin Ding Jian Ding Rong. Numerical research on the effect of impeller clocking position on vibration of multistage centrifugal pumps[J]. Journal of Vibration and Shock, 2015, 34(24): 117-122

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