Thermal and acoustic performance of silencing heat exchanger for engine waste heat recovery

Shi, Lingfeng; Xu, Wen; Ma, Xiaonan; Wang, Xuan; Tian, Hua; Shu, Gequn

doi:10.1016/j.applthermaleng.2021.117711

Cited by 11 publications

(5 citation statements)

References 24 publications

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“…Lab for evaluating its acoustic performance. [20][21][22] The transmission loss indicates the difference between the incident sound power level L Wi at inlet and the transmitted sound power level L Wt at outlet, which reflects a inherent property of muffler component, that is, it is not affected by sound source and external environment, only related to the muffler itself. The calculation formula is expressed as…”

Section: Acoustic Performance Analysismentioning

confidence: 99%

“…Lab for evaluating its acoustic performance. 20–22 The transmission loss indicates the difference between the incident sound power level L Wi at inlet and the transmitted sound power level L Wt at outlet, which reflects a inherent property of muffler component, that is, it is not affected by sound source and external environment, only related to the muffler itself. The calculation formula is expressed asWhere W i and W t respectively represent inlet incident sound power and outlet transmitted sound power with the unit of W; p i and p t are the incident sound pressure at inlet and the transmitted sound pressure at outlet, Pa; S i and S t stand for the cross-sectional areas at the inlet and outlet of exhaust muffler, respectively, m 2 .…”

Section: Acoustic Performance Analysismentioning

confidence: 99%

See 1 more Smart Citation

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Zhang

Chen

Tian

et al. 2023

Noise & Vibration Worldwide

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In order to improve the acoustic performance of an internal combustion forklift exhaust muffler, this paper considered the influence of air flow and temperature, based on the flow field analysis theory, the exhaust muffler’s fluid domain model at the highest engine speed was established, that is, the complex flow and temperature fields were numerically simulated with a computational fluid dynamics (CFD) model, and the acoustic calculation was carried out by the finite element mothod (FEM), obtaining the velocity and temperature cloud maps and transmission loss curve. In addition, according to the simulation results, the improvement strategy towards intake pipe structural parameters was proposed. Numerical simulations indicate that for the improved exhaust muffler, flow eddy regions are obviously decreased, temperature gradient distribution is uniform, the transmission loss in most frequency bands and the overall sound attenuation effect are improved, which will lay a technical foundation for future physical application and multi-field coupling research.

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Section: Acoustic Performance Analysismentioning

confidence: 99%

Section: Acoustic Performance Analysismentioning

confidence: 99%

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Zhang

Chen

Tian

et al. 2023

Noise & Vibration Worldwide

View full text Add to dashboard Cite

show abstract

“…They obtained the data in their study by using the CFD program and conducting experimental studies. As a result, they found that the metal foam exhaust muffler provides better heat dissipation, reduces the exhaust pressure by 8.4%, and reduces the noise by 44.4% [10]. Kashikar and his friends introduced a new design by optimizing the KTM 390 stock exhaust muffler to reduce exhaust noise.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Kepekçi,

Ağca

2024

International Journal of Automotive Engineering and Technologies

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Exhaust mufflers are used in automobiles to prevent the noise arising from exhaust gases resulting from internal combustion engines. With the advancement of the automotive industry, exhaust mufflers have become more complex over time to reduce noise and increase driving comfort. Within the scope of this study, exhaust muffler geometries with different geometries have been designed, and harmonic acoustic analyses have been carried out. In the analysis, the airflow speed has been accepted as 30 m/s. Acoustic pressure and transmission loss data obtained because of analyses performed with 1Pa pressure input have been evaluated. As a result of the evaluations, it has been concluded that the muffler modeled in a complex structure has been better acoustically. Although the main task of exhaust muffler is to reduce the sound level at the exit of exhaust gases, it is also important to reduce the temperature of the air in the exhaust system and have good thermal conductivity so as not to jeopardize the thermal safety of the system. For this reason, CFD thermal flow analysis has been carried out with 4 different materials using a complex design with high acoustic efficiency. Gray cast iron, stainless steel, 1020 steel, and aluminum have been used as materials. In this part of the study, it has been determined that the use of aluminum material has been better in terms of thermal efficiency.

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“…Fu et al proposed and designed a new exhaust purification process for silencers, utilizing the finite volume method to investigate the effects of various expansion ratios, chamber length ratios, and length-todiameter ratios on the flow range characteristics of diesel engine exhaust purification silencers [2]. The use of computational fluid dynamics (CFD) simulation software to model the internal flow ranges of IOP Publishing doi:10.1088/1742-6596/2775/1/012045 2 silencers [3][4][5][6][7] can significantly reduce experimental costs and is a common method for analyzing their aerodynamic performance. Jokandan et al used COMSOL software to predict the transmission loss and pressure loss in general-purpose silencers with diverse internal components, finding that incorporating expanded pipes inside the chamber can increase transmission loss and decrease pressure loss [8].…”

Section: Introductionmentioning

confidence: 99%

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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Thermal and acoustic performance of silencing heat exchanger for engine waste heat recovery

Cited by 11 publications

References 24 publications

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Numerical investigation for acoustic performance improvement of a forklift exhaust muffler with the influence of flow and temperature fields

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

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

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