Acoustic attenuation analysis of circular dual-chamber mufflers with non-uniform flow

The frequency-domain linearized Navier-Stokes equations (LNSEs) are employed to predict the acoustic attenuation performance of circular dual-chamber mufflers with non-uniform flow. The steady flow in mufflers is calculated by computational fluid dynamics (CFD) and then transferred to non-consistent acoustic mesh from CFD mesh. Finally, the finite element method of LNSEs is adopted to predict acoustic attenuation performance of muffler. This paper focuses on the effects of various configurations on acoustic attenuation performance of mufflers in the presence of flow, including (1) the number of inner tubes, (2) the length of inner tubes, and (3) the non-coaxial tubes. The numerical predictions show that the flow changes the acoustic attenuation performance of mufflers.