Computational Fluid Dynamics-Based Numerical Analysis of Acoustic Attenuation and Flow Resistance Characteristics of Perforated Tube Silencers
Computational Fluid Dynamics-Based Numerical Analysis of Acoustic Attenuation and Flow Resistance Characteristics of Perforated Tube Silencers
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DOI：
10.1115/1.4026137
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发表时间：
2014-04
期刊：
影响因子：
--
通讯作者：
Chen Liu;Z. Ji
中科院分区：
文献类型：
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作者：
Chen Liu;Z. Ji
采用三维时域计算流体力学（CFD）方法对无流动和有流动的多孔管消声器的消声性能进行了计算。对于横流孔管消声器和直通式孔管消声器，传输损失预测与文献中可用的实验测量结果吻合较好。然后，采用三维时域CFD方法研究了流速和温度对多孔管消声器消声性能的影响。数值计算结果表明，横流式孔管消声器在大多数频率下的传输损失随着气流的增大而增大，而气流对平面波范围内的声衰减影响不大，而对直通式孔管消声器在较高频率处的声衰减增加。提高空气温度使传输损耗曲线向更高的频率移动，并使共振峰有所降低。利用CFD进行了三维定常流动计算，预测了多孔管消声器的压降。在相同流量条件下，横流孔管消声器的压降远高于直通式孔管消声器，且随着孔隙率的增加，直通式孔管消声器的压降逐渐增大。
The 3D time-domain computational fluid dynamics (CFD) approach is used to calculate the acoustic attenuation performance of perforated tube silencers without and with flow. For the crossflow perforated tube silencer and straight-through perforated tube silencers, the transmission loss predictions agree well with the experimental measurements available in the literature. Then, the 3D time-domain CFD approach is employed to investigate the effects of flow velocity and temperature on the acoustic attenuation performance of perforated tube silencers. The numerical results demonstrated that the transmission loss is increased at most frequencies for the crossflow perforated tube silencer as the air flow increases, while the air flow has little influence on the acoustic attenuation in the plane wave range and increases the acoustic attenuation at higher frequencies for the straight-through perforated tube silencers. Increasing the air temperature shifts the transmission loss curve to higher frequency and lowers the resonance peaks somewhat. The pressure drops of perforated tube silencers are predicted by performing the 3D steady flow computation using CFD. The pressure drop of the crossflow perforated tube silencer is much higher than those of the straight-through perforated tube silencer at the same flow conditions, and the pressure drop of the straight-through perforated tube silencer increases gradually as the porosity increases.