Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses

Document Type : Invited by Davoud Younesian

Authors

1 Ph.D. Candidate, Faculty of Mechanical Engineering, K.N. Toosi University of Technology

2 Professor, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran

3 Professor, Faculty of Mechanical Engineering, K.N. Toosi University of Technology

4 Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran.

Abstract

Transmission loss and noise reduction of reactive mufflers are determined by linear acoustic theory and unsteady flow field study, respectively. The effects of extending the inlet tube of the muffler, adding holes to the extension, and the number of holes on both transmission loss and noise reduction are investigated. In noise reduction analysis, the Navier-Stokes equations and k-ε model are used to study the unsteady turbulent flow. Helmholtz equation is solved for transmission loss analysis. The present study is validated with experimental data. Numerical results show a rise in noise reduction by extending the inlet tube of the muffler and increasing its length. Moreover, the extended mufflers cause more transmission loss and broadband behavior at some frequencies due to the resonances. According to the results, different points of view in the investigation of acoustic attenuation performance of mufflers can be helpful to understand more and better about the effect of geometrical parameters.

Highlights

  • Linear acoustic theory and unsteady flow field are considered.
  • The Navier-Stokes equations, k- ε model, and Helmholtz equation are used.
  • Effects of geometrical parameters on acoustic attenuation are studied.
  • Different views are found necessary to study acoustic attenuation performance.

Keywords

Main Subjects

References

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