Title: Acoustic damping of an annular tail-pipe under mean flow conditions
Authors: Boonen, Rene
Sas, Paul
Van den Bulck, Eric
Issue Date: 1-Jun-2015
Host Document: Proceedings of the Euronoise 2015 pages:2249-2254
Conference: Euronoise edition:2015 location:maastricht date:01-03 June 2015
Article number: 220
Abstract: A damping device, consisting of an annular tail-pipe, has been developed. It is applicable in situations wherein acoustic damping is required in combination with low flow resistance. The device consists of a central tube surrounded by a narrow slit. The central tube has an acoustic mass which impedance increases with frequency while the slit resistance remains constant. When the frequency has been increased sufficiently, a considerable part of the acoustic flow passes through the slit where it will be damped. In this way, acoustic energy can be dissipated while the flow experiences a low flow resistance. The acoustic properties of the device will be investigated using an electrical equivalent circuit. The impedance will be measured using an impedance measurement duct, from which the slit resistance will be deduced. The resulting slit resistance consists of a linear part depending on the air viscosity, and a non-linear part which is caused by the loss of kinetic energy of the fluidum through the slit. The presence of a laminar mean flow does not effect the acoustic performance of the annular tailpipe, only some minor effects are observed in the low frequency range. Even with a mean turbulent flow, the acoustic damping mechanism still remains intact.
ISSN: 2226-5147
Publication status: published
KU Leuven publication type: IC
Appears in Collections:Mechanical Engineering Technology TC, Campus Group T Leuven
Technologiecluster Werktuigkundige Industriële Ingenieurstechnieken
Production Engineering, Machine Design and Automation (PMA) Section
Applied Mechanics and Energy Conversion Section

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