This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Aeroacoustics of Duct Branches-With Application to Silencers
Technical Paper
2011-24-0218
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
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.
Recommended Content
Authors
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.Also In
References
- Davies, P. O. A.L. “Practical flow duct acoustics” Journal of Sound and Vibration 124 91 115 1988
- Munjal, M. L. Acoustics of duct and mufflers Wiley-Interscience New York 1987
- Powell, A. “Theory of vortex sound” Journal of the Acoustical Society of America 36 177 195 1964
- Karlsson, M. Åbom, M. “Quasi-steady model of the acoustic scattering properties of a T-junction” Journal of Sound and Vibration 2011 10.1016/j.jsv.2011.05.012
- Karlsson, M. Glav, R. “The Flow Reversal Resonator,” SAE Technical Paper 2007-01-2203 2007 10.4271/2007-01-2203
- Dubos, V. Kergomard, J. Khettabi, A. Dalmont, J. P. Keefe, D. H. Nederveen, C. J. “Theory of Sound Propagation in a Duct with a Branched Tube Using Modal Decomposition” Acta Acustica 85 153 169 1999
- Nederveen, C. J. Jansen, J. K. M. Hassel, R. R. v. “Corrections for Woodwind Tone-Hole Calculations” Acustica 84 957 966 1998
- Karlsson, M. Åbom, M. “Aeroacoustics of T-junctions-an experimental study” Journal of Sound and Vibration 329 1793 1808 2010 10.1016/j.jsv.2009.11.024
- Föller, S. Polifke, W. Tonon, D. “Aeroacoustic Characterization of T-Junctions Based on Large Eddy Simulation and System Identification” AIAA-2010-3985, 16th AIAA/CEAS Aeroacoustics Conference Stockholm, Sweden 2010
- Karlsson, M. Åbom, M. “On the Use of Linear Acoustic Multiports to Predict Whistling in Confined Flows” Acta Acustica united with Acustica 97 24 33 2011 10.3813/AAA.918383
- Bruggeman, J. C. Hirschberg, A. van Dongen, M. E. H. “Self-sustained aero-acoustic pulsations in gas transport systems: Experimental study of the influence of closed side branches” Journal of Sound and Vibration 150 371 393 1991
- Graf, H. R. Ziada, S. “Excitation source of a side-branch shear layer” Journal of Sound and Vibration 329 2825 2842 2010
- Dequand, S. Hulshoff, S. J. Aurégan, Y. Huijnen, J. Riet, R. t. Lier, L. J. v. Hirschberg, A. “Acoustics of 90 degree sharp bends. Part II: Low-frequency aeroacoustical response” Acta Acustica 90 13 23 2004
- Durrieu, P. Hofmans, G. Ajello, G. Boot, R. Aurégan, Y. Hirschberg, A. Peters, M. C. A. M. “Quasisteady aero-acoustic response of orifices” Journal of the Acoustical Society of America 110 1859 1872 2001
- Miller, D. S. Internal flow systems 2 nd Edition BHR Group Limited Cranfield, Bedford, UK 1990
- Seybert, A. F. Ross, D. F. “Experimental determination of acoustic properties using two-microphone random excitation technique” Journal of the Acoustical Society of America 61 1362 1370 1977
- Munjal, M. L. Doige, A. G. “Theory of a two source-location method for direct experimental evaluation of the four-pole parameters of an aeroacoustic element” Journal of Sound and Vibration 141 323 333 1990
- Nelson, P. A. Halliwell, N. A. Doak, P. E. “Fluid dynamics of a flow excited resonance, Part I: Experiment” Journal of Sound and Vibration 78 15 38 1981
- Nelson, P. A. Halliwell, N. A. Doak, P. E. “Fluid dynamics of a flow excited resonance, Part II: Flow acoustic interaction” Journal of Sound and Vibration 91 375 402 1983