通过流作用下穿孔板的声阻抗  

Acoustic impedance of perforated plates with bias flow

作　　者：陈志响 季振林[1] CHEN Zhixian;JI Zhcnlin(School of Power and Energy Engineering,Harbin Engineering University Harbin 150001)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001

出　　处：《声学学报》2020年第2期235-246,共12页Acta Acustica

基　　金：国家自然科学基金项目(11674076)资助。

摘　　要：穿孔元件在进排气消声器中广泛使用,气体流动对穿孔元件声阻抗具有较大的影响。为了获得更加精确的穿孔声阻抗模型,使用三维时域CFD方法计算通过流作用下穿孔的声阻抗。探究了通过流作用下穿孔声阻抗的获取方法,并且将无量纲小孔声阻抗的预测值与已发表的实验测量值进行了对比,两者吻合较好。分析了小孔中的通过流马赫数M_o (0.05~0.20)、穿孔的分布形式、小孔的直径d_h (2~5 mm),穿孔板的厚度t (0.8~2 mm)和穿孔率φ(4.51%~24.93%)对无量纲声阻抗的影响规律,并且通过不同参数的非线性回归分析得到了通过流作用下声阻抗的模型。作为工程计算的应用,利用Jing&Sun的声阻抗模型和本文声阻抗模型计算了横流式穿孔管消声器的传递损失,与实验测量结果比较表明,本文模型具有较高的准确性。The perforated components are widely used in the intake and exhaust mufflers.Fluid flow has a great influence on the acoustic impedance of perforated components.In order to obtain a precise perforate acoustic impedance model,the present study employs the three-dimensional time-domain Computational Fluid Dynamics(CFD) approach to determine the acoustic impedance of the orifice in the presence of bias flow.The determination method of perforate acoustic impedance is explored and good agreements between the numerical predictions and published measurements of non-dimensional acoustic impedance of orifice are observed.The numerical evaluations are carried out for different bias flow Mach number M_o(0.05-0.20) through the orifice,distribution of the orifices,thickness t(0.8-2 mm) and porosity(4.51%-24.93%) of the perforated plates and their influence on the acoustic impedance of perforate is studied in detail.The acoustic impedance model is obtained by using nonlinear regression analysis of the various results of the parametric studies.As an application,the transmission loss of cross flow perforated tube mufflers is predicted by using Jing & Sun model and the present model.The comparison between measured and predicted values demonstrated that the present model yields high accurate prediction.

关 键 词：声阻抗率 传递损失 无量纲 穿孔率 马赫数 横流式 穿孔管消声器 

分 类 号：TB535.2[理学—物理]