可压缩偏流条件下穿孔板声阻抗率的分析

Analysis of the Acoustic Impedance of Perforated Panels with a Compressible Bias Flow

从理论上研究了一维可压缩偏流对穿孔声阻抗率的影响,并分析了偏流对穿孔粘滞效应的影响;在实验中,利用真空泵流装置建立了存在偏流时的穿孔板声阻抗率测量系统,测量了一定频率范围内两块不同厚度穿孔板在不同偏流流速时声阻抗率的变化规律.在偏流情况下,穿孔板相对声阻率的理论结论和实验数据吻合很好.

The influence of one-dimension compressible bias flow on the acoustic impedance of perforated panels was discussed with consideration of the compressibility of flow. And the change of the viscidity effect in an orifice with bias flow was studied on the basis of the method of parametric perturbation. The system was set up by using vacuum pump to measure the acoustic impedance of perforated panels with bias flow. The acoustic impedances of two perforated panels were measured in a variety of frequency with bias flow of different velocity. The theoretical results of the relative resistance of perforated panels with bias flow are in good accordance with the experimental results.