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摘要
The acoustic impedance of perforated plates is influenced by fluid flow through the orifice. The present study employs the three-dimensional (3-D) time-domain computational fluid dynamics (CFD) approach to determine the acoustic impedance of perforated plates with bias flow, and the extraction method of acoustic impedance of perforated plates is presented. The non-dimensional acoustic impedance of orifices is predicted, and the good agreement between the numerical predictions and the measurements in published literature validates the present CFD approach. The numerical evaluations are carried out for different bias flow Mach number M-0 (0.05-0.20) through the orifice, distribution form of the orifices, the ratio t/d(h)(0.2-0.5) of orifice thickness to diameter, Reynolds number Re of flow through the orifice and porosity phi(4.51%-24.93%) of the perforated plates. The effects of related parameters on the non-dimensional acoustic impedance of orifices are analyzed in detail. The expressions of acoustic impedance are obtained by using nonlinear regression analysis of the various results of the parametric studies. As an application of engineering calculation, the transmission loss (TL) of cross-flow perforated tube mufflers with flow is predicted by using Jing and Sun model and the present model via finite element computations. The comparison between measured and predicted values showed the accuracy of the present model.
- 出版日期2019-4-28
- 单位哈尔滨工程大学
