Aeroacoustics of T-junctions: An experimental investigation
2010 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 329, no 10, 1793-1808 p.Article in journal (Refereed) Published
An experimental method for determining the aeroacoustic properties of side branch orifices allowing for any combination of grazing and bias flow is presented. The geometry studied, a T-junction, is treated as an active acoustic three-port. The passive properties, describing the reflection and transmission of an incident acoustic wave, are described by a system matrix while the active properties are described by a source vector. Expressions for the acoustic impedance under various mean flow and acoustic incidence configurations are developed. In addition, methods for identifying regions where the system can generate sound, by studying only the passive properties, are discussed. A self-sustained oscillation is triggered at one of the identified regions by coupling a resonant system to the three-port.
Place, publisher, year, edition, pages
2010. Vol. 329, no 10, 1793-1808 p.
GRAZING MEAN FLOW, ACOUSTIC-IMPEDANCE, PERFORATED PLATES, CIRCULAR ORIFICE, BOUNDARY-LAYER, FLUID MACHINES, PIPE, SYSTEMS, DUCT, POTENTIALITY
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-28712DOI: 10.1016/j.jsv.2009.11.024ISI: 000274926800012ScopusID: 2-s2.0-77954372075OAI: oai:DiVA.org:kth-28712DiVA: diva2:390209
QC 201101212011-01-212011-01-192011-02-08Bibliographically approved