Measurement of perforate impedance with grazing flow on both sides
2016 (English)In: 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics., American Institute of Aeronautics and Astronautics, 2016Conference paper (Refereed)
In this paper, the acoustic impedance of a microperforated plate (MPP) with two-sided grazing flow is educed by a modified semi-analytical inverse technique. The MPP sample is placed in the middle of a rectangular duct with grazing flow. The mode matching formulation is derived in terms of pressure for a MPP with two-sided grazing flow. The inputs to this mode matching technique are complex acoustic pressure measured at twelve positions at the wall of the duct, upstream and downstream of the MPP section. First the ability of the code to reproduce the pressure field for a given impedance is tested. Second the ability to educe the correct impedance for a given pressure distribution is tested. The results of the mode matching code are in good agreement with the simulations for no flow cases.
Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2016.
Mechanical Engineering Aerospace Engineering
IdentifiersURN: urn:nbn:se:kth:diva-192866DOI: 10.2514/6.2016-2853ScopusID: 2-s2.0-84982962151OAI: oai:DiVA.org:kth-192866DiVA: diva2:972578
AIAA/CEAS Aeroacoustics Conference
FunderEU, FP7, Seventh Framework Programme, 289352
QC 201609272016-09-212016-09-212016-09-27Bibliographically approved