Effects of trapezoidal cutting at blade outlet on flow-induced noise of centrifugal pump volute
GUO Rong1,2, LI Xiaobing1, LIU Xiang1, LI Tianpeng1
1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
2.Gansu Provincial Key Lab of Fluid Machinery and Systems, Lanzhou 730050, China
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%.
郭荣1,2,李小兵1，刘向1,李天鹏1. 叶片出口梯形切割对离心泵蜗壳流激噪声影响的研究[J]. 振动与冲击, 2023, 42(13): 82-91.
GUO Rong1,2, LI Xiaobing1, LIU Xiang1, LI Tianpeng1. Effects of trapezoidal cutting at blade outlet on flow-induced noise of centrifugal pump volute. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(13): 82-91.
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