Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations
The three-dimensional frequency-domain linearized Navier-Stokes equations (LNSEs) with consideration of eddy viscosity are developed to evaluate the acoustic attenuation performance of perforated hybrid mufflers in the presence of non-uniform flow. The computations are performed in two steps: time a...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2024-01-01
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| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1177/16878132231226055 |
| _version_ | 1797348782183022592 |
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| author | He Zhirong Ji Zhenlin Fan Yiliang |
| author_facet | He Zhirong Ji Zhenlin Fan Yiliang |
| author_sort | He Zhirong |
| collection | DOAJ |
| description | The three-dimensional frequency-domain linearized Navier-Stokes equations (LNSEs) with consideration of eddy viscosity are developed to evaluate the acoustic attenuation performance of perforated hybrid mufflers in the presence of non-uniform flow. The computations are performed in two steps: time averaged flow variables are acquired by using steady-state computational fluid dynamics (CFD) method and then mapped into the acoustic mesh, and the acoustic perturbation variables are obtained by solving frequency-domain LNSEs, where the sound-absorbing material is treated as an equivalent fluid with complex sound speed and density. The predictions of transmission losses of the two-pass perforated hybrid mufflers in the presence of non-uniform flow are in good consistencies with the measurements, which verifies the correctness of LNSEs. The effect of Mach numbers on acoustic attenuation performance of the mufflers with different filling densities and perforated components is investigated in detail. The transmission loss of the mufflers with various filling densities are increased by complex airflow in the lower frequency range. For the mufflers where not all components have been perforated, the flow lowers low-frequency resonance peak. The influence of complex airflow on acoustic attenuation performance of all configurations is weakened at higher frequencies. |
| first_indexed | 2024-03-08T12:11:05Z |
| format | Article |
| id | doaj.art-bf04becc4ef04ec2ad472d75b04e6cc4 |
| institution | Directory Open Access Journal |
| issn | 1687-8140 |
| language | English |
| last_indexed | 2024-03-08T12:11:05Z |
| publishDate | 2024-01-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-bf04becc4ef04ec2ad472d75b04e6cc42024-01-22T22:03:20ZengSAGE PublishingAdvances in Mechanical Engineering1687-81402024-01-011610.1177/16878132231226055Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equationsHe ZhirongJi ZhenlinFan YiliangThe three-dimensional frequency-domain linearized Navier-Stokes equations (LNSEs) with consideration of eddy viscosity are developed to evaluate the acoustic attenuation performance of perforated hybrid mufflers in the presence of non-uniform flow. The computations are performed in two steps: time averaged flow variables are acquired by using steady-state computational fluid dynamics (CFD) method and then mapped into the acoustic mesh, and the acoustic perturbation variables are obtained by solving frequency-domain LNSEs, where the sound-absorbing material is treated as an equivalent fluid with complex sound speed and density. The predictions of transmission losses of the two-pass perforated hybrid mufflers in the presence of non-uniform flow are in good consistencies with the measurements, which verifies the correctness of LNSEs. The effect of Mach numbers on acoustic attenuation performance of the mufflers with different filling densities and perforated components is investigated in detail. The transmission loss of the mufflers with various filling densities are increased by complex airflow in the lower frequency range. For the mufflers where not all components have been perforated, the flow lowers low-frequency resonance peak. The influence of complex airflow on acoustic attenuation performance of all configurations is weakened at higher frequencies.https://doi.org/10.1177/16878132231226055 |
| spellingShingle | He Zhirong Ji Zhenlin Fan Yiliang Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations Advances in Mechanical Engineering |
| title | Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations |
| title_full | Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations |
| title_fullStr | Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations |
| title_full_unstemmed | Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations |
| title_short | Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations |
| title_sort | acoustic attenuation prediction and analysis of perforated hybrid mufflers with non uniform flow based on frequency domain linearized navier stokes equations |
| url | https://doi.org/10.1177/16878132231226055 |
| work_keys_str_mv | AT hezhirong acousticattenuationpredictionandanalysisofperforatedhybridmufflerswithnonuniformflowbasedonfrequencydomainlinearizednavierstokesequations AT jizhenlin acousticattenuationpredictionandanalysisofperforatedhybridmufflerswithnonuniformflowbasedonfrequencydomainlinearizednavierstokesequations AT fanyiliang acousticattenuationpredictionandanalysisofperforatedhybridmufflerswithnonuniformflowbasedonfrequencydomainlinearizednavierstokesequations |