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

被引：0
|
作者：
Guo R. [1 ,2 ]
Li X. [1 ]
Liu X. [1 ]
Li T. [1 ]
机构：
[1] College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou
[2] Gansu Provincial Key Lab of Fluid Machinery and Systems, Lanzhou
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 13期
关键词：
acoustic vibration couple; centrifugal pump; pressure fluctuation; rotor-stator interaction; trapezoidal cutting;
D O I：
10.13465/j.cnki.jvs.2023.13.010
中图分类号：
学科分类号：
摘要：
Here, to explore effects of trapezoidal cutting at blade outlet on volute flow-induced noise of centrifugal pump, a single-stage single-suction centrifugal pump with the specific speed of 66 was taken as the study object, by defining cutting width coefficient δ and radial height coefficient γ, 9 cutting schemes were designed. Based on RNG k-ε turbulence model, fully 3-D unsteady numerical simulation was performed for the centrifugal pump. Then, the boundary element method (BEM) was used to calculate internal field noise, and the finite element method (FEM) coupled with acoustic BEM was used to calculate flow-induced noise in external field. Hydraulic characteristics and noise radiation characteristics of centrifugal pump under different cutting schemes were analyzed, and tests were conducted to verify the correctness of numerical calculation. The results showed that rotor-stator interaction is the main reason for flow-induced noise of centrifugal pump volute appearing; reasonable blade outlet trapezoidal cutting can make hydraulic performance of centrifugal pump basically stable, and effectively reduce intensity of rotor-stator interaction and level of flow-induced noise of volute; after adopting the cutting scheme with the optimal acoustic performance, sound pressure levels at inlet and outlet monitoring points on blade-frequencies reduce by 13% and 7.5%, respectively, and sound pressure levels at outfield noise monitoring points reduce by 2.4%. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：82 / 91
页数：9
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