Aeroacoustics of Duct Branches-With Application to Silencers

Paper #:
  • 2011-24-0218

Published:
  • 2011-09-11
Citation:
Karlsson, M., Abom, M., and Glav, R., "Aeroacoustics of Duct Branches-With Application to Silencers," SAE Technical Paper 2011-24-0218, 2011, https://doi.org/10.4271/2011-24-0218.
Pages:
8
Abstract:
The inclusion of flow-acoustic interaction effects in linear acoustic multiport models has been studied. It is shown, using a T-junction as illustration example, that as long the acoustic system is linear the required information is included in a scattering matrix obtained by experimental or numerical studies. Assuming small Mach numbers and low frequencies-as in most automotive silencer applications-the scattering matrix for the T-junction can be approximated using quasi-steady models. Models are derived that holds for all possible configurations of grazing and bias flow in the T-junctions. The derived models are then used to predict the performance of a novel silencer concept, where a resonator is formed by acoustically short-circuiting the inlet and outlet ducts of a flow reversal chamber. The agreement between experiments and simulations is excellent, justifying the use of the quasi-steady modeling approach.
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