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

Journal of Theoretical and Applied Vibration and Acoustics

Hadi Khorand¹  Mahya Mohammadi²  Cyrus Aghanajafi³  Seyed Esmail Razavi⁴ 

[1] Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran.;Ph.D. Candidate, Faculty of Mechanical Engineering, K.N. Toosi University of Technology;Professor, Faculty of Mechanical Engineering, K.N. Toosi University of Technology;Professor, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;

关键词: Transmission loss;    Noise reduction;    Reactive muffler;    k-ε model;    Helmholtz equation;   

DOI  :  10.22064/tava.2018.85071.1106

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown