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Acoustic behaviour of elliptical mufflers with single-inlet and double-outlet

Acoustic behaviour of elliptical mufflers with single-inlet and double-outlet
Acoustic behaviour of elliptical mufflers with single-inlet and double-outlet
Expansion chambers with single-inlet and double-outlet are used in the exhaust system of internal combustion engines since they provide noise attenuation similar to simple chambers (single inlet/outlet), and reduce the flow noise and back pressure. This work presents a detailed analysis of the acoustic attenuation performance of elliptical expansion chambers with single-inlet and double-outlet. First, the finite element method (FEM) is considered in order to obtain a reference solution. Then, the mode-matching method (MMM) is applied at the area discontinuities of the muffler, considering a circular inlet pipe, a central elliptical chamber and two circular outlet pipes. This method reduces the computational requirements and enables to couple the acoustic fields within each region, described by means of Mathieu functions in the elliptical chamber and Bessel functions in the circular pipes. The solution given by this analytical approach is compared with finite element results and experimental measurements for a selected configuration, showing a good agreement. The acoustic behaviour is then analysed in detail as a function of the chamber length, the . eccentricity of the elliptical cross-section and the position of the inlet and outlet pipes. Some potential means to improve the acoustic performance are proposed.
3287-3294
Denia, F.D.
5a64479b-10d6-482b-8f25-dc5b4ef39780
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Albelda, J.
f7944b16-85ab-487f-b7c4-6f3736b0e232
Fuenmayor, F.J.
452423ef-ca4b-4004-8ece-9e3dd0ca886e
Denia, F.D.
5a64479b-10d6-482b-8f25-dc5b4ef39780
Baeza, L.
09dc5565-ad4b-49af-a104-d4b6ad28e1b0
Albelda, J.
f7944b16-85ab-487f-b7c4-6f3736b0e232
Fuenmayor, F.J.
452423ef-ca4b-4004-8ece-9e3dd0ca886e

Denia, F.D., Baeza, L., Albelda, J. and Fuenmayor, F.J. (2003) Acoustic behaviour of elliptical mufflers with single-inlet and double-outlet. In Proceedings of the Tenth International Congress on Sound and Vibration. pp. 3287-3294 .

Record type: Conference or Workshop Item (Paper)

Abstract

Expansion chambers with single-inlet and double-outlet are used in the exhaust system of internal combustion engines since they provide noise attenuation similar to simple chambers (single inlet/outlet), and reduce the flow noise and back pressure. This work presents a detailed analysis of the acoustic attenuation performance of elliptical expansion chambers with single-inlet and double-outlet. First, the finite element method (FEM) is considered in order to obtain a reference solution. Then, the mode-matching method (MMM) is applied at the area discontinuities of the muffler, considering a circular inlet pipe, a central elliptical chamber and two circular outlet pipes. This method reduces the computational requirements and enables to couple the acoustic fields within each region, described by means of Mathieu functions in the elliptical chamber and Bessel functions in the circular pipes. The solution given by this analytical approach is compared with finite element results and experimental measurements for a selected configuration, showing a good agreement. The acoustic behaviour is then analysed in detail as a function of the chamber length, the . eccentricity of the elliptical cross-section and the position of the inlet and outlet pipes. Some potential means to improve the acoustic performance are proposed.

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More information

Published date: 2003
Additional Information: cited By 10
Venue - Dates: Tenth International Congress on Sound and Vibration, Stockholm, Sweden, Stockholm, Sweden, 2003-07-06 - 2003-07-09
Organisations: Dynamics Group

Identifiers

Local EPrints ID: 411147
URI: http://eprints.soton.ac.uk/id/eprint/411147
PURE UUID: 252df587-50e8-4432-8f55-384c888776ce
ORCID for L. Baeza: ORCID iD orcid.org/0000-0002-3815-8706

Catalogue record

Date deposited: 15 Jun 2017 16:31
Last modified: 08 Jan 2022 03:29

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Contributors

Author: F.D. Denia
Author: L. Baeza ORCID iD
Author: J. Albelda
Author: F.J. Fuenmayor

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