Numerical investigation of the acoustic behavior of a multi-perforated liner
Numerical investigation of the acoustic behavior of a multi-perforated liner
复制标题
多孔衬管声学行为的数值研究
DOI：
10.2514/6.2007-3683
复制
发表时间：
2007
影响因子：
3.7
通讯作者：
M. Shoeybi
中科院分区：
文献类型：
--
作者：
J. Eldredge;D. Bodony;M. Shoeybi
本文用不可压大涡模拟方法计算了湍流通过多孔衬管的声响应。一个大阵列的孔径的效果占通过模拟一个单一的射流与周期性的条件在两个方向上切向板。平行于板的流动被包括在孔的上方和下方的区域中，孔在切向流动方向上倾斜，如在实际的薄膜冷却衬套中。通过孔的质量流率被施加有叠加在平均分量上的小正弦扰动。声学行为是通过测量由强迫引起的孔径上的波动压力差来确定的。在这项工作中，两个不同的强迫频率被认为是。在这些频率下，计算了力和响应之间的传递函数，该传递函数代表衬垫的声阻抗。与现有的理论相比，当后者被修改的厚度和倾斜的光圈时，发现良好的协议。
The acoustic response of a turbulent flow through a multi-perforated liner is computed with incompressible LES. The effect of a large array of apertures is accounted for by simulating a single jet with periodic conditions in both directions tangential to the plate. Flows that are parallel to the plate are included in the regions above and below the aperture, which is tilted in the tangential flow direction as in practical film cooling liners. The mass flow rate through the aperture is forced with a small sinusoidal perturbation superposed on a mean component. The acoustic behavior is determined by measuring the fluctuating pressure difference across the aperture that results from the forcing. In this work, two different forcing frequencies are considered. The transfer function between forcing and response, which represents the acoustic impedance of the liner, is calculated for these frequencies. Good agreement is found when compared with existing theory, when the latter is modified for the thickness and tilting of the aperture.