Effects of trapezoidal cutting at blade outlet on flow-induced noise of centrifugal pump volute

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (13) : 82-91.

GUO Rong1,2, LI Xiaobing1, LIU Xiang1, LI Tianpeng1

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Abstract

In order to explore the influence of trapezoidal cutting at the blade outlet on the flow induced noise of centrifugal pump volute, a single-stage single suction centrifugal pump with specific speed of 66 was taken as the object, the cutting width coefficient and radial height coefficient were defined δ and γ,nine cutting schemes were designed. Based on RNG k-ε turbulence model, the three-dimensional unsteady numerical simulation of centrifugal pump was carried out. On this basis, the boundary element method (BEM) was used to calculate the internal field noise, and the structural finite element (FEM) coupled acoustic boundary element method was used to calculate the external field flow induced noise. The hydraulic characteristics and noise radiation characteristics of centrifugal pump under different cutting schemes were analyzed, and the accuracy of numerical calculation was verified by experimental method. The research shows that the rotor-stator interaction was the main cause of the flow induced noise of the volute of the centrifugal pump. The reasonable trapezoidal cutting of the blade outlet can basically stabilize the hydraulic performance of the centrifugal pump and effectively reduce the rotor-stator interaction intensity and the flow induced noise level of the volute. The sound pressure level at the inlet and outlet monitoring points at the blade frequency decreased by 13% and 7.5% respectively, and the sound pressure level at the field noise monitoring points decreased by 2.4%.

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centrifugal pump / trapezoidal cutting / rotor-stator interaction / pressure fluctuation / acoustic vibration couple

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GUO Rong1,2, LI Xiaobing1, LIU Xiang1, LI Tianpeng1. Effects of trapezoidal cutting at blade outlet on flow-induced noise of centrifugal pump volute[J]. Journal of Vibration and Shock, 2023, 42(13): 82-91

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