The Effect of Length on the Acoustic Attenuation Performance of Concentric Expansion Chambers: An Analytical, Computational, and Experimental Investigation

Paper #:
  • 950544

Published:
  • 1995-02-01
Citation:
Selamet, A. and Radavich, P., "The Effect of Length on the Acoustic Attenuation Performance of Concentric Expansion Chambers: An Analytical, Computational, and Experimental Investigation," SAE Technical Paper 950544, 1995, https://doi.org/10.4271/950544.
Pages:
14
Abstract:
Expansion chambers are widely used in the breathing systems of engines due to their desirable broadband noise attenuation characteristics. Following an earlier analytical and computational work of Sahasrabudhe et al. (1992), the present study investigates the effect of the length on the acoustic attenuation performance of concentric expansion chambers. Three approaches are employed to determine the transmission loss: (1) a two-dimensional, axisymmetric analytical solution; (2) a three-dimensional computational solution based on the boundary element method; and (3) experiments on an extended impedance tube setup with nine expansion chambers fabricated with fixed inlet and outlet ducts, fixed chamber diameters, and varying chamber length to diameter ratios from to 3.53. The results from all three approaches are shown to agree well. The effect of multi-dimensional propagation is discussed in comparison with the classical treatment for the breakdown of planar waves. The study also provides a simple relation for the number of repeating attenuation domes prior to the domination of higher order modes in terms of the l/d ratio of the expansion chamber.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2017-06-15
Training / Education
2017-06-15
Training / Education
2017-06-15
Technical Paper / Journal Article
2010-09-28
Training / Education
2018-02-05
Book
2002-04-15