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Aeroacoustics of T-junctions—An experimental investigation

✍ Scribed by Mikael Karlsson; Mats Åbom

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
858 KB
Volume
329
Category
Article
ISSN
0022-460X

No coin nor oath required. For personal study only.

✦ Synopsis

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.

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