混合膨胀腔消声器声学性能时域CFD分析

摘要

The three-dimensional time-domain CFD approach was used to compute the acoustic attenuation performance of hybrid expansion chamber silencers. Firstly, the calculation principle and procedure of the three-dimensional time-domain CFD method was introduced. Then, the transmission loss of the hybrid expansion chamber silencers was predicted by this method, and good agreements among the time-domain approach results, measurement results and finite element method (FEM) results were observed. The numerical results demonstrate that the resistivity has an obvious influence on the acoustic attenuation performance of the hybrid expansion chamber silencers.%将三维时域CFD法应用于计算混合膨胀腔消声器声学性能。首先介绍了三维时域CFD法的计算原理与过程。接着使用该方法预测了混合膨胀腔消声器传递损失，时域法计算结果与实验测量结果、有限元法计算结果吻合良好。计算结果表明，流阻率对混合膨胀腔消声器消声性能有显著影响。