Acoustic Attenuation Performance of Perforated Tube Silencer Based on Computational Fluid Dynamics Results

doi:10.3901/JME.2017.01.079

Abstract

Abstract: To accurately study acoustic attenuation performance of a car perforated tube silencer under temperature and air flow influence, structural and fluid models are established, computational fluid dynamics (CFD) and acoustic finite element meshes are generated, respectively. CFD software Fluent is used to simulate and calculate temperature and velocity field of the silencer. Mesh mapping approach is employed to transfer CFD meshes with temperature and velocity dates to acoustic meshes. By using CFD results as boundary condition of acoustic field analysis, LMS Virtual.Lab Acoustics software is applied to carry out a numerical simulation on the internal acoustic field of the silencer and obtain its transmission loss curves. The results show that increasing air temperature shift transmission loss curve to higher frequency. The curve is moved to lower frequency as air flow exists and transmission loss is increased, especially within the low frequency brand between 20 Hz and 200 Hz these changes are visible, but overall the range is small.

Key words: acoustic performance, computational fluid dynamics results, mesh mapping, transmission loss, perforated tube silencer

GUO Lixin, FAN Wei. Acoustic Attenuation Performance of Perforated Tube Silencer Based on Computational Fluid Dynamics Results[J]. Journal of Mechanical Engineering, 2017, 53(1): 79-85.

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