Study of acoustic and aerodynamic performance of reactive silencer with different configurations: Theoretical, modeling and experimental

Rahimi Jokandan, Motaleb; safari variani, Ali; Ahmadi, Saeid

doi:10.1016/j.heliyon.2023.e20058

Heliyon

2023

DOI: 10.1016/j.heliyon.2023.e20058

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Study of acoustic and aerodynamic performance of reactive silencer with different configurations: Theoretical, modeling and experimental

Motaleb Rahimi Jokandan,

Ali safari variani,

Saeid Ahmadi

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2024

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Cited by 3 publications

References 23 publications

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Analysis of pressure loss and transmission loss under flow field effects in multi-chamber muffler

Wo,

Hu,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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In order to achieve broadband sound attenuation, a muffler utilizes multiple internal impedance structures, which unavoidably impacts its aerodynamic performance. Multi-chamber muffler configurations, incorporating interconnecting tubes, perforated plates, and other sound-absorbing elements, can generate several resonance peaks within the frequency range of sound attenuation, showcasing effective sound attenuation capabilities. These configurations are commonly employed in marine muffler structures. This paper examines the factors influencing the flow field performance of such mufflers and the impact of the internal flow field on their acoustic performance by using principles of fluid mechanics and the finite element method of acoustics. Initially, a flow field domain model of the multi-chamber muffler is developed by using the 3D modeling software SOLIDWORKS, and the mesh division of the flow field is executed by using the FLUENT MESHING preprocessing software. Subsequently, the mesh model is employed to simulate the flow field performance in the ANSYS Fluent environment, calculating the pressure loss of various structural mufflers under different inlet flow boundary conditions. Finally, field data is imported into the LMS Virtual. Lab software to validate the correlation between the flow field network and the acoustic field network, enabling the mapping of flow field data to simulate the silencer’s acoustic performance under different flow field conditions. The study demonstrates that a well-designed arrangement of interconnected pipes and perforated elements inside the silencer can notably diminish its pressure loss. Furthermore, it highlights that the impact of a temperature gradient on the silencer’s acoustic performance is more significant compared to the local flow rate.

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Analysis of pressure loss and transmission loss under flow field effects in multi-chamber muffler

Wo,

Hu,

Chen

et al. 2024

J. Phys.: Conf. Ser.

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Review on attenuation methods of low-frequency noise in passive silencers

Karami,

Shokri Rad,

Karimipour

2024

Journal of Low Frequency Noise, Vibration and Active Control

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Noise reduction in various industrial and building systems such as ventilation ducts, vehicles, wind tunnels, and test facilities for jet engines, automobiles, and factories has always interested engineers, especially the problematic noise reduction at low frequencies. This problem is even more important with passive silencers, which require absorbent materials and more space. Passive silencers include reactive and dissipative silencers. Among reactive silencers, Helmholtz resonators, expansion chambers, flute-like, drum-like, and plate silencers have proven effective at low frequencies. Combining some of these silencers with a dissipative silencer, called a hybrid silencer, can achieve excellent performance at a wide range of low to high frequencies. In these silencers, the reactive part reduces noise at low frequencies, and the dissipative part reduces noise at medium and high frequencies. The aim of this work, which focuses more on experimental studies, is to introduce the mentioned silencers, investigate the presented methods to improve the performance of these silencers at low frequencies, and offer the practical advantages and disadvantages of these methods.

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Acoustic Transmission Loss of a Cylindrical Silencer Filled with Multilayer Poroelastic Materials Based on Mode-Matching Method

Yang,

Seong

2024

JMSE

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The efficacy of silencers in reducing piping noise is contingent upon the specific installation and operating environment. Among the various forms of silencers, the acoustic characteristics of dissipative silencers with sound-absorbing materials attached internally exist in an area that is difficult to explain by existing theories. This is dependent upon the specific type and placement of the attached sound-absorbing materials. This paper presents a methodology for calculating the acoustic transmission loss (TL) of a cylindrical silencer filled with a multilayer poroelastic material, employing the mode-matching method. To describe the numerical process of treating waves propagating within a poroelastic material and determine the modes in accordance with the boundary conditions necessary for analyzing the acoustic performance of the silencer, the Biot model and the Johnson–Champoux–Allard–Lafarge model were employed. The obtained modes were utilized to calculate the acoustic TL of silencers filled with single, double, and triple layers of poroelastic materials. In particular, the results obtained for the single layer were validated by comparing them with the results of a finite element analysis, and the results obtained for multiple layers with the same material were validated by comparing them with the equivalent single-layer results. Moreover, the results of the numerical calculations of the acoustic TLs of the silencer for three distinct types of poroelastic materials, including those with varying degrees of frame rigidity or softness, were compared, and the acoustic characteristics were analyzed in relation to the intrinsic properties of the materials and their arrangement. It is anticipated that the methodology presented in this paper will facilitate the design of silencers using poroelastic materials in accordance with the specific requirements of users or designers by allowing for a comprehensive consideration of the thickness of layers and the arrangement of materials.

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Study of acoustic and aerodynamic performance of reactive silencer with different configurations: Theoretical, modeling and experimental

Cited by 3 publications

References 23 publications

Analysis of pressure loss and transmission loss under flow field effects in multi-chamber muffler

Analysis of pressure loss and transmission loss under flow field effects in multi-chamber muffler

Review on attenuation methods of low-frequency noise in passive silencers

Acoustic Transmission Loss of a Cylindrical Silencer Filled with Multilayer Poroelastic Materials Based on Mode-Matching Method

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