Acoustic impedance of perforated plate with grazing flow
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摘要: 应用三维时域数值方法研究掠过流对穿孔板声阻抗的影响。建立了掠过流作用下穿孔板声阻抗计算的计算流体动力学(CFD)模型,通过时域计算得到掠过流作用下穿孔板的声阻抗,分析结构参数和掠过流马赫数对穿孔板声阻抗的影响。根据计算结果拟合掠过流作用下穿孔板声阻抗的近似表达式,利用获得的穿孔声阻抗新公式预测穿孔管消声器的传递损失,数值预测和实验结果吻合良好。计算结果表明,掠过流对穿孔板的声阻抗和穿孔管消声器的消声性能有明显影响。Abstract: The three-dimensional time-domain approach is used to investigate the effect of grazing flow on the acoustic impedance of perforated plate.The CFD(Computational Fluid Dynamics) simulation model for the acoustic impedance of perforated plate with grazing flow is built and the perforation acoustic impedance is evaluated by the CFD computation in time domain.The effects of structural parameters and grazing flow on the perforation acoustic impedance are analyzed.Based on the numerical results,the curve-fitting expressions for perforation acoustic impedance are provided. In combination with the perforation acoustic impedance with grazing flow,the transmission loss of perforated tube silencers is predicted and good agreements between the numerical predictions and measurements are observed.The results demonstrated that the grazing flow influences obviously the perforation acoustic impedance and the acoustic attenuation characteristics of perforated tube silencers.
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