Experimental investigation of an in-duct orifice with bias flow under medium and high level acoustic excitation
2014 (English)In: International Journal of Spray and Combustion Dynamics, ISSN 1756-8277, Vol. 6, no 3, 267-292 p.Article in journal (Refereed) Published
This paper experimentally investigates the acoustic properties of an orifice with bias flow under medium and high sound level excitation. Orifices with two different edge configurations were tested. The study includes a wide range of bias flow velocities, various acoustic excitation levels and different frequencies. The nonlinear acoustic scattering matrix was identified by a finely controled two-source method. Aeroacoustic modal analysis was introduced based on eigenvalue-decomposition. Acoustic properties, such as impedance, nonlinear scattering matrix and the eigenvalues were compared and discussed. Experimental results also show that bias flow makes the acoustic properties more complex compared to the no bias flow case, especially when the velocity ratio between acoustic particle velocity and mean flow velocity is near unity.
Place, publisher, year, edition, pages
Multi-Science Publishing, 2014. Vol. 6, no 3, 267-292 p.
Acoustic impedance, Acoustic properties, Acoustic wave transmission, Eigenvalues and eigenfunctions, Flow velocity, Modal analysis, Orifices, Scattering parameters, Velocity Acoustic excitation, Acoustic particle velocity, Different frequency, Experimental investigations, Mean flow velocities, Non-linear acoustics, Nonlinear scattering, Velocity ratio
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-128454DOI: 10.1260/1756-8222.214.171.1247ISI: 000342262900004ScopusID: 2-s2.0-84907447220OAI: oai:DiVA.org:kth-128454DiVA: diva2:647617
QC 20141028. Updated from submitted to published.2013-09-112013-09-112015-05-22Bibliographically approved