叶片出口角影响离心泵噪声辐射数值研究  

Numerical study on the effect of blade outlet angle on centrifugal pump noise

作　　者：丁剑[1] 刘厚林[1] 王勇[1] 谈明高[1] 崔建保[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《振动与冲击》2014年第2期122-127,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51109095;51079062;51179075);国家科技支撑计划(2011BAF14B03);江苏省自然科学基金(BK2010346;BA2010155;BY2011140);江苏高校优势学科建设工程项目

摘　　要：运用FEM\BEM声振耦合计算方法分析叶片出口角对离心泵在水动力激励下泵壳振动辐射噪声影响。采用大涡模拟方法模拟离心泵内部瞬态流场,获得蜗壳壁面偶极子声源;对泵壳体结构进行模态分析获得结构模态响应;利用LMS Virtual Lab间接边界元IBEM声振耦合模块计算非定常流动引起的离心泵内部噪声,并与实验数据对比,验证基于LES、声振耦合的噪声数值模拟方法可行性。计算离心泵外场噪声及声辐射,研究叶片出口角度对离心泵外场噪声辐射影响。结果表明,离心泵叶片通过频率BPF处的辐射声功率随叶片出口角的增大而增大;外场噪声声压级指向性分布显示叶片出口角存在合适范围,使泵在小流量工况运行时噪声较小。The FEM ／BEM acoustic-vibro-coupling method was applied to study the effect of blade outlet angle on centrifugal pump noise caused by hydrodynamic forces. The large eddy simulation （LES） method was used to solve the transient flow field of the pump, and the volute surface dipole was obtained. The modes of the pump housing structure were analyzed using the finite element method （FEM）. The acoustie-vibro-coupling module of the Virtual Lab software was employed to study the interior sound field of the pump caused by unsteady flow. By comparing the computational results with experimental ones, the method of LES combined with FEM／BEM for centrifugal pump noise computation was verified. On this basis, the outer sound fields were investigated, and the effect of blade outlet angle on outer sound fields was studied. The results show that the sound power at the blade passing frequency （BPF） becomes large as the blade outlet angle increases and the blade outlet angle should be at suitable range to ensure a lower noise level at low flow rates.

关 键 词：离心泵 叶片出口角 大涡模拟 声振耦合 噪声 

分 类 号：TH311[机械工程—机械制造及自动化]