Effect of mean flow and damping on the performance of reactive mufflers

Authors

  • P.T. Thawani Dept. of Mech. Engng., Univ. of Calgary, Calgary, Alta., Canada
  • A.G. Doige Dept. of Mech. Engng., Univ. of Calgary, Calgary, Alta., Canada

Keywords:

noise abatement, mean flow, damping, reactive mufflers, mathematical modeling, exhaust mufflers, plane wave propagation, transfer matrices, noise reduction

Abstract

Inclusion of mean flow effects in the mathematical modeling of exhaust mufflers has been found to be essential for achieving realistic results. Two mathematical models are presented which apply to plane wave propagation through a pipe or an expansion chamber including the effect of mean flow and damping. The solutions of the governing equations are represented by 2×2 transfer matrices. In evaluating the performance of exhaust mufflers, noise reduction (NR) is calculated using an open end termination. The measured NR characteristics of the tested laboratory mufflers are in excellent agreement with those predicted by the transfer matrix approach. The method of NR calculation is quite general in its application and can be extended further to optimize muffler configuration at the design stage

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Published

1983-01-01

How to Cite

1.
Thawani P, Doige A. Effect of mean flow and damping on the performance of reactive mufflers. Canadian Acoustics [Internet]. 1983 Jan. 1 [cited 2021 Oct. 24];11(1):29-47. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/497

Issue

Section

Technical Articles