Experimental investigations of perforated liners with bias flow
Experimental investigations of perforated liners with bias flow
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DOI：
10.1121/1.428128
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发表时间：
1999-10
影响因子：
2.4
通讯作者：
X. Jing;Xiaofeng Sun
中科院分区：
文献类型：
--
作者：
X. Jing;Xiaofeng Sun
已经发现，偏流的存在可以增强穿孔衬里的低频吸声。因此，了解偏流衬管的声学特性对实际应用具有重要意义。本文对有偏流的穿孔衬管的声学特性进行了实验研究。首先，实验结果表明，偏流的存在下，显着增加的吸收系数和有效带宽的穿孔内衬。其次，它是在本实验中所示，板厚度有一个主要的影响，与偏流衬里的声学性能。提出了一个简单的模型来考虑这种行为，该模型给出了良好的协议与实测数据。考虑到吹气和吸气对开孔药型罩表面平均剪切流的影响不同，本文还对吹气和吸气的实验结果进行了比较。
It has been found that the presence of a bias flow can enhance the low-frequency sound absorption of a perforated liner. Therefore it is important to understand the acoustic characteristics of a liner with bias flow for practical applications. This paper presents experimental investigations of the acoustic properties of a perforated liner with bias flow. First, the experimental results show that the presence of a bias flow markedly increases both the absorption coefficient and effective bandwidth of a perforated liner. Second, it is shown in the present experiment that plate thickness has a major influence on the acoustic properties of a liner with bias flow. A simple model is presented to consider this behavior; the model gives good agreement with the measured data. Considering that blowing and suction will have a different effect on the mean shear flow over the surface of a perforated liner, comparative experimental results between blowing and suction are also included in the present investigation.