双级膨胀腔消声器声学与阻力特性的CFD仿真分析

使用二维轴对称时域CFD法计算双级膨胀腔消声器在无流和有流条件下的声衰减性能，并与实测结果进行比较。由于时域方法在计算中可以考虑复杂气流流动和介质粘性的影响，因而可以比较准确地预测双级膨胀腔消声器的传递损失。基于定常流动模型，使用Fluent软件预测双级膨胀腔消声器的压力损失，CFD计算结果与实验测量结果吻合良好。

Simulative Analysis of Acoustic Attenuation and Flow Resistance Characteristics of a Double Expansion Chamber Silencer Using CFD Approach

The axisymmetric time-domain CFD method is employed to calculate the acoustic attenuation performance of a double expansion chamber silencer without and with air flow. The prediction results are compared with the experimental measurement data. Since the influences of complex gas flow and viscosity on the sound propagation and attenuation inside the silencer are included in the time-domain CFD simulation, the time-domain CFD method can accurately predict the transmission loss of the double expansion chamber silencer. Finally, the pressure drops of the double expansion chamber silencer are calculated by means of Fluent code based on the steady flow model. The CFD predictions are found to agree well with the experimental results.