Double-Layer Microperforated Panel/Porous Absorber as Liner for Anechoic Closing of the Test Section in Wind Tunnels
Double-Layer Microperforated Panel/Porous Absorber as Liner for Anechoic Closing of the Test Section in Wind Tunnels
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DOI：
10.3813/aaa.918350
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发表时间：
2010
影响因子：
--
通讯作者：
P. Cobo;Heidi Ruiz;Julian Alvarez
中科院分区：
文献类型：
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作者：
P. Cobo;Heidi Ruiz;Julian Alvarez
本文研究了混合双层微穿孔板/多孔系统作为宽带吸收体在风洞试验区封闭中的应用。对于这种应用，吸收器应满足双重要求：在500至14000 Hz的频带内提供吸收，并且与空气静脉接触的面必须没有多孔材料。用于计算在垂直入射时的吸收系数的方程允许预测作为其本构参数的函数的这样的系统的性能。最后，在阻抗管和风洞中建立了一个在（500，14000）Hz频带内平均吸收率为94%的原型，并进行了实验验证。
This work investigates the use of hybrid double-layer microperforated panel/porous systems as wideband absorbers for applications in the closing of the test area of wind tunnels. For such an application, the absorber should fulfil a twofold requirement: provide absorption in a frequency band ranging from 500 up to 14000 Hz, and the face in contact with the air vein must be free of porous material. The equations for calculating the absorption coefficient at normal incidence allows to predict the performance of such a system as a function of its constitutive parameters. A prototype providing average absorption of 94% in the frequency band (500, 14000) Hz is finally built and validated experimentally in both an impedance tube and a wind tunnel.