Numerical Estimation of End Corrections in Extended-Duct and Perforated-Duct Mufflers

[+] Author and Article Information
A. J. Torregrosa, A. Broatch, R. Payri

CMT Dept. Máquinas y Motores Térmicos, Universidad Politécnica de, Valencia, Spain

F. González

Dept. de ingeniería Mecánica y de Materiales, Universidad Politécnica de, Valencia, Spain

J. Vib. Acoust 121(3), 302-308 (Jul 01, 1999) (7 pages) doi:10.1115/1.2893980 History: Received February 01, 1998; Revised December 01, 1998; Online February 26, 2008


One-dimensional models for extended-duct and perforated-duct mufflers require the introduction of end corrections in order to account for multidimensional effects at the junctions. In this paper, a numerical two-dimensional finite element calculation has been used in order to obtain information on these end corrections. The results have been validated through comparison with experimental measurements performed with a modified version of the impulse method. Then, the influence of the different geometric characteristics of the mufflers on the end correction have been studied. A general correlation in terms of relevant nondimensional parameters is given for extended-duct mufflers, whereas for perforated mufflers a general correlation has not been obtained due to the eventual coupling with other attenuation mechanisms.

Copyright © 1999 by The American Society of Mechanical Engineers
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