Acoustic propagation in a flow duct with an orifice plate
2008 (English)In: PROCEEDINGS OF ISMA 2008: INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING, VOLS. 1-8, 2008, 485-495 p.Conference paper (Refereed)
In this paper we present calculations of sound wave propagation in a straight duct with an orifice plate and a mean flow present. The wave propagation is modelled with a frequency domain linearized Navier-Stokes equations methodology. A two-dimensional approximation is used to an axisymmetric cylindrical geometry, and an appropriate frequency scaling is utilized to account for this. The relation between pressure and density is assumed isentropic and correction for duct damping based on viscous dissipation in the acoustic boundary layers is applied. Calculations are carried out for frequencies in the plane wave range up to the cut-on frequency of the first higher order propagating acoustical mode, and performed with a commercial Finite Element Method code on a quadrilateral mesh with third order shape functions. Results of transmission through, and reflections at the orifice are presented on a two-port scattering matrix form and are compared to measurements with good agreement.
Place, publisher, year, edition, pages
2008. 485-495 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-26118ISI: 000263409900035ISBN: 978-90-73802-86-5OAI: oai:DiVA.org:kth-26118DiVA: diva2:370151
International Conference on Noise and Vibration Engineering, Leuven, BELGIUM, SEP 15-17, 2008
QC 201011152010-11-152010-11-152011-09-27Bibliographically approved