Acoustic propagation in a lined duct using a wave expansion method
2012 (English)In: 41st International Congress and Exposition on Noise Control Engineering, INTER-NOISE, Institute of Noise Control Engineering (INCE) , 2012, Vol. 8, 6577-6587 p.Conference paper (Other academic)
Acoustic liners are used extensively in engineering applications, particularly in aero-engines. Liners are characterised by a complex impedance, which is dependent on the grazing flow velocity and acoustic pressure spectrum at the liner surface. The acoustic propagation through a lined duct is examined in this paper using a wave expansion method. This is a highly efficient full domain discretisation method, based on interpolation of plane wave functions, which is suitable for solving a convected Helmholtz equation. For a potential flow, the boundary layer and the lined wall are included in the numerical scheme by the Myers boundary condition. This assumes that the acoustic pressure and particle velocity are continuous across a thin boundary layer. The acoustic propagation through a flow-impedance tube is computed in order to validate the implementation of the impedance boundary condition in this scheme. Good agreement with the experimental data from the literature is shown.
Place, publisher, year, edition, pages
Institute of Noise Control Engineering (INCE) , 2012. Vol. 8, 6577-6587 p.
Acoustic impedance, Acoustic noise, Boundary conditions, Boundary layers, Ducts
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-131332ScopusID: 2-s2.0-84883594227ISBN: 978-162748560-9OAI: oai:DiVA.org:kth-131332DiVA: diva2:656544
41st International Congress and Exposition on Noise Control Engineering 2012, INTER-NOISE 2012; New York, NY; United States; 19 August 2012 through 22 August 2012
QC 201310162013-10-162013-10-142016-05-09Bibliographically approved