考虑气流影响的直通穿孔管消声器声学性能

为了研究气流对消声器传递损失的影响,采用有限元法(finite element method,FEM)和计算流体力学法(computational fluid dynamics,CFD)相结合的方法来解决这种流声耦合问题.以直通穿孔管消声器为例,计算出它们存在气流时的传递损失,并与文献中的实验数据和预测结果进行对比,以验证计算结果的准确性.研究结果表明:当忽略消声器内部气流引起的湍流噪声时,随着气流速度的增加,除了共振峰值处的传递损失显著减小外,多数频率处的传递损失有所增加,尤其是在较高频段内变化较为明显;随着气流温度的增加,传递损失曲线向高频方向移动.

Acoustic Performance of the Straight-Through Perforated Pipe Silencer Considering the Effect of Gas Flow

In order to investigate the effect of gas flow on transmission loss (TL )， the finite element method (FEM) was used in conjunction with the computational fluid dynamics (CFD) to solve the problem of flow-sound coupling. The TL of the straight-through perforated pipe silencer was calculated using the CFD/FEM approach in the presence of gas flow， whose results were compared with the experimental data and predictions from the literature so as to validate the accuracy of the present study. It was concluded that with the increase of flow velocity ， the TL decreases remarkably at the resonance peak and increases at most frequencies， especially at the higher frequencies when the turbulence noise induced by gas flow is neglected， and with the increase of gas temperature， the TL curve shifts to higher frequencies.