Slow sound in lined flow ducts

The Journal of the Acoustical Society of America
Yves Aurégan, V Pagneux

Abstract

The acoustic propagation in lined flow duct with purely reactive impedance at the wall is considered. This reacting liner has the capability to reduce the speed of sound, and thus to enhance the interaction between the acoustic propagation and the low Mach number flow ( M≃0.3). At the lower frequencies, there are typically four acoustic or hydrodynamic propagating modes, with three of them propagating in the direction of the flow. Above a critical frequency, there are only two propagating modes that all propagate in the direction of the flow. From the exact two-dimensional formulation an approximate one-dimensional model is developed to study the scattering of acoustic waves in a straight duct with varying wall impedance. This simple system, with a uniform flow and with non-uniform liner impedance at the wall, permits to study the scattering between regions with different wave characteristics. Several situations are characterized to show the importance of negative energy waves, strong interactions between acoustic and hydrodynamic modes, or asymmetric scattering.

References

Mar 17, 2011·Physical Review Letters·Silke WeinfurtnerGregory A Lawrence
Jul 27, 2011·The Journal of the Acoustical Society of America·Ygaäl Renou, Yves Aurégan
Jan 1, 2011·Living Reviews in Relativity·Carlos BarcelóMatt Visser

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Citations

Jun 3, 2016·The Journal of the Acoustical Society of America·Yves AuréganJean-Philippe Groby
Jul 21, 2016·Proceedings. Mathematical, Physical, and Engineering Sciences·Jean-François Mercier, Agnès Maurel
May 8, 2019·Scientific Reports·Maaz FarooquiVincent Pagneux
Nov 15, 2018·The Journal of the Acoustical Society of America·Maaz FarooquiVincent Pagneux
Nov 2, 2019·The Journal of the Acoustical Society of America·Antonin CoutantVincent Pagneux
Nov 3, 2017·The Journal of the Acoustical Society of America·Lei XiongWenping Bi
Jun 24, 2018··Yves AuréganMaaz Farooqui

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