摘要
为了探究低比转速离心泵流噪声分布特性,本文基于大涡模拟(LES)结合有限元(FEM)的混合法对不同工况下泵内部声源特性进行求解,获得了泵内部流噪声频域响应特性,揭示了不同声源对流噪声的贡献,并基于傅里叶逆变换(IFFT)对频谱进行转化,阐明流噪声随时间的变化规律。研究表明:由于动静干涉作用,叶轮出口具有较高的声功率;叶片偶极子噪声主要受流体作用在叶片表面的脉动载荷激励,呈现典型的宽频噪声,随着流量增加,叶片载荷增加,泵出口平均总声压级提高;蜗壳偶极子噪声主要受动静干涉作用激励,呈现典型的单音噪声分布,叶频分量的离散信号幅值明显;随着流量增加,噪声能量逐渐增加。
In order to investigate the distribution characteristics of flow induced acoustic of low specific speed centrifugal pumps,the hybrid method of large eddy simulation(LES)combined with finite element(FEM)is utilized to solve the internal sound source characteristics under different working conditions.The frequency domain response characteristics of acoustic and the contribution of the different sources to the acoustic are obtained.Furthermore,the frequency spectrum is trans-formed to elucidate the temporal variation of acoustic,using the Fourier inverse transform(IFFT).Results demonstrate that the sound power level located in the impeller outlet is higher than other region due to the dynamic and static interference(DSI).The blade dipole acoustic is mainly excited by the pulsating loads acting on the blade surfaces,manifests as typical broadband noise.With an increase in flow rate,the blade load increases,leading to a higher overall average sound pressure level at the pump outlet.The volute dipole noise,mainly excited by the interaction between stationary and moving parts,exhibits a typical tonal noise distribution.The amplitude of discrete signals of the blade frequency component is significant and increases with the flow rate.
作者
顾嘉嵘
高波
倪丹
张宁
王非凡
GU Jiarong;GAO Bo;NI Dan;ZHANG Ning;WANG Feifan(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China;Shanghai Kaiquan Pump(Group)Co.,Ltd.,Shanghai 201800,China)
出处
《工程热物理学报》
北大核心
2025年第8期2576-2583,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金项目(No.51576090,No.52376024)
江苏省研究生科研创新计划(No.KYCX22_3644)。
关键词
低比转速离心泵
流噪声
声压级
数值模拟
low specific speed centrifugal pump
fow induced acoustic
sound pressure level
nu-merical simulation
