离心泵水动力噪声研究综述

从组成部分、理论研究、数值计算研究以及试验研究4个方面介绍离心泵水动力噪声的研究现状.在国内外学者研究工作的基础上,从内声场和外声场2个方面详细概述了离心泵水动力噪声的组成部分及影响因素的研究现状,其中内声场从噪声的频谱特性可分为离散噪声和宽带噪声,离散噪声主要是由于动静干涉导致,能量集中在叶频及其谐频; 而宽带噪声的研究目前还有很多工作待开展.FW-H方程是声比拟理论中计算离心泵水动力噪声的基本方程,应用广泛,同时涡声理论也表现出其很好的发展前景.基于声比拟法的混合数值模拟是目前离心泵水动力噪声模拟的主流途径,而诸如线性欧拉法(LEE)等声传播方程法的应用相对较少,未来随着对离心泵中高频段噪声研究的深入,声传播方程法也将会得到应用.用水听器构建双端口模型,可以准确测得离心泵低频段噪声,但该方法对试验条件要求较高,成本较大; 麦克风阵列法在测量离心泵内部声场中的高频段噪声成分时具有良好的研究前景.最后提出在未来的研究中需要解决的难题以及值得关注的方向.

Review of research on hydrodynamic noise of centrifugal pump

The research status of hydrodynamic noise of centrifugal pump is introduced from four aspects:component,theoretical analysis,numerical simulation and experiment.Based on the research work in the world,the current research status of the components and influencing factors of the hydrodynamic noise is summarized in detail in terms of internal sound field and external sound field.The internal sound field can be divided into discrete noise and broadband noise from the spectrum characteristics of the noise.The discrete noise is mainly caused by the rotor-stator interaction,and the energy is concentrated in the blade passing frequency and its harmonic frequencies.In the research of broadband noise,a lot of work still need to be done.FW-H equation is the basic equation for calculating the hydrodynamic noise of centrifugal pump in the theory of acoustic analogy,which is extensively used.At the same time,the theory of vortex sound also shows a quite good development prospect.At present,the hybrid numerical simulation based on the acoustic analogy method is the mainstream approach for simulating the hydrodynamic noise of centrifugal pump,thus,the application of the acoustic propagation equation method such as the Linear Euler Method(LEE)is less adopted.Nevertheless,the acoustic propagation equation method will be applied with continuously unfolding study on the high-frequency noise of centrifugal pump in the future.The hydrophone-based dual port model can measure the low-frequency noise of centrifugal pump accurately,but this method requires higher standard testing conditions and is costly.The microphone array method has a better prospect in measuring the high-frequency noise in the internal sound field of centrifugal pump.Finally,the problems to be solved in the future and the topics worthy of being noted are put forward.