Abstract
The three-dimensional time-domain computational fluid dynamics approach is employed to calculate and analyze the sound attenuation behavior of water-filled perforated pipe silencers. Transmission loss predictions from the time-domain computational fluid dynamics approach and the frequency-domain finite element method agree well with each other for the straight-through and cross-flow perforated pipe silencers without flow. Then, the time-domain computational fluid dynamics approach is used to investigate the effects of flow velocity, diameter, and porosity of orifices on the sound attenuation behavior of the silencers. The numerical predictions demonstrate that the flow increases the transmission loss, especially at high frequencies. Based on the above analysis, partially plugged straight-through perforated pipe silencer is proposed to improve the sound attenuation performance by increasing the flow velocity through the orifices. In order to eliminate the pass frequency of the perforated pipe silencers and improve the sound attenuation performance in mid- to high-frequency range, a folded straight-through perforated pipe silencer is designed and its sound attenuation behavior is analyzed numerically using the time-domain computational fluid dynamics approach.
Highlights
Silencers with perforated components are widely used in piping systems for their reliable noise attenuation performance.[1]
To examine the influence of porosity, the main structures of straight-through pipe silencers (PPSs) and cross-flow PPS remained the same and the row of perforations is reduced from 20 to 10 in the axial direction, the porosity is reduced to 7.5% from 15%
The time-domain computational fluid dynamics (CFD) approach is used to examine the influence of mean flow, perforation diameter, and porosity on the sound attenuation behaviors of straight-through and crossflow PPSs, respectively
Summary
Silencers with perforated components are widely used in piping systems for their reliable noise attenuation performance.[1] The three-dimensional (3D) frequencydomain methods such as finite element method (FEM) and boundary element method (BEM) are the commonly used approaches for the prediction of acoustic behavior of silencers.[2,3] The advantages of frequencydomain methods are the fast computation and convenient employment. These methods may include the potential flow effect only and excluded the influences of complex flow and viscosity on the sound propagation and attenuation in the silencers. The multi-dimensional time-domain computational fluid dynamics (CFD) approach has been
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