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CLC number: TK402

On-line Access: 2012-08-30

Received: 2012-06-22

Revision Accepted: 2012-07-27

Crosschecked: 2012-08-06

Cited: 5

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Journal of Zhejiang University SCIENCE A 2012 Vol.13 No.9 P.709-716

http://doi.org/10.1631/jzus.A1200155


CFD analysis of a transfer matrix of exhaust muffler with mean flow and prediction of exhaust noise


Author(s):  Lian-yun Liu, Zhi-yong Hao, Chi Liu

Affiliation(s):  Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   liulianyun1988@yahoo.com.cn, haozy@zju.edu.cn

Key Words:  Computational fluid dynamics (CFD), Transfer matrix, Mean flow, Acoustical source, Exhaust noise


Lian-yun Liu, Zhi-yong Hao, Chi Liu. CFD analysis of a transfer matrix of exhaust muffler with mean flow and prediction of exhaust noise[J]. Journal of Zhejiang University Science A, 2012, 13(9): 709-716.

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%A Chi Liu
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T1 - CFD analysis of a transfer matrix of exhaust muffler with mean flow and prediction of exhaust noise
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1200155


Abstract: 
A multi-dimensional computational fluid dynamics (CFD) approach was proposed in this study aiming to calculate the transfer matrix of an engine exhaust muffler in the conditions with and without mean flow. The CFD model of the muffler with absorptive material defined as porous zone was calibrated with the measured noise reduction without mean flow, and was further employed to study the effect of the mean flow on the acoustic performance of the muffler. Furthermore, the exhaust acoustical source was derived from the calculated transfer matrices of six different additional acoustic loads obtained by the proposed CFD approach as well as the measured tail noise based on a multiload least squares method. Finally, the exhaust noise was predicted based on Thevenin’s theorem. The proposed CFD approach was suggested to be able to predict the acoustic performance of a complex muffler considering mean flow (without and with mean flow) and heat transfer, and provide reasonable results of the exhaust noise.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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