叶片出口梯形切割对离心泵蜗壳流激噪声影响的研究

郭荣1,2,李小兵1,刘向1,李天鹏1

振动与冲击 ›› 2023, Vol. 42 ›› Issue (13) : 82-91.

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PDF(4190 KB)
振动与冲击 ›› 2023, Vol. 42 ›› Issue (13) : 82-91.
论文

叶片出口梯形切割对离心泵蜗壳流激噪声影响的研究

  • 郭荣1,2,李小兵1,刘向1,李天鹏1
作者信息 +

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

  • GUO Rong1,2, LI Xiaobing1, LIU Xiang1, LI Tianpeng1
Author information +
文章历史 +

摘要

为探究叶片出口梯形切割对离心泵蜗壳流激噪声的影响,以一台比转速为66的单级单吸离心泵为对象,通过定义切割宽度系数δ与径向高度系数γ,设计了9种切割方案。基于RNG k-ε湍流模型对离心泵进行全三维非定常数值模拟,在此基础上采用边界元(BEM)法计算内场噪声,采用结构有限元(FEM)耦合声学边界元方法计算外场流激噪声。分析不同切割方案下离心泵水力特性和噪声幅射特性,并采用试验方法验证数值计算的准确性。研究表明:动静干涉是离心泵蜗壳流激噪声产生的主要原因,合理的叶片出口梯形切割能够使离心泵水力性能基本稳定的同时有效降低动静干涉强度及蜗壳流激噪声水平;声学性能最优切割方案,叶频处的进、出口监测点声压级分别下降13%和7.5%,外场噪声监测点声压级下降2.4%。

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%.

关键词

离心泵 / 梯形切割 / 动静干涉 / 压力脉动 / 声振耦合

Key words

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

引用本文

导出引用
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[J]. Journal of Vibration and Shock, 2023, 42(13): 82-91

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