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首页> 外文期刊>The Journal of the Acoustical Society of America >Acoustic of a perforated liner with grazing flow: Floquet-Bloch periodical approach versus impedance continuous approach
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Acoustic of a perforated liner with grazing flow: Floquet-Bloch periodical approach versus impedance continuous approach

机译：带有掠流的穿孔衬管的声学特性：Floquet-Bloch定期进样与阻抗连续进样

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摘要

The effect of a shear flow on an acoustic liner consisting of a perforated plate backed by cavities is studied. Two different approaches are investigated: First, the duct and the liner are considered as a periodic system while in the second approach the liner is considered as homogeneous and described by an impedance. Those two approaches coincide perfectly without flow for a small hole spacing compared to the acoustic wavelength. This work demonstrates that those two approaches are not wholly consistent when a shear flow is present and reveals some problems in the use of the local impedance with flow. The no-flow impedance cannot be used to describe the liner when a shear flow is present. An equivalent impedance with flow can be defined but it depends on the direction of the incident waves and loses its local characteristic. (C) 2016 Acoustical Society of America.
机译：研究了剪切流对由衬有孔的多孔板组成的声学衬里的影响。研究了两种不同的方法：首先，将导管和衬管视为周期性系统，而在第二种方法中，将衬管视为均质并用阻抗来描述。与声波波长相比，这两种方法在孔间距很小的情况下完全没有流动，完全重合。这项工作表明，当存在剪切流动时，这两种方法并不完全一致，并且揭示了在使用局部阻抗和流动时存在一些问题。当存在剪切流动时，无流动阻抗不能用于描述衬管。可以定义流动的等效阻抗，但它取决于入射波的方向，并失去其局部特性。 （C）2016年美国声学学会。

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