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Optimum impedance in the presence of an inviscid sheared flow
KTH.
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2018 (English)In: 2018 AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics, 2018, article id AIAA 2018-3777Conference paper, Published paper (Refereed)
Abstract [en]

In recent years, much effort has been devoted to find the “optimum impedance” i.e. the impedance that results in the maximum modal decay rate in flow duct acoustics. Although such analysis can be carried out by means of numerical simulations, analytical expressions can also be derived in order to predict the optimum impedance. Previous works have been concerned over the optimum impedance of higher order modes in rectangular ducts with uniform flow. In this work, the analysis is expanded to circular and rectangular ducts for both uniform and sheared inviscid flows. Focus is given on a typical aero-engine intake and flight conditions. It is shown that, in certain conditions, the optimum impedance is affected even by the presence of a small boundary layer thickness. It is also noted that for low Helmholtz numbers the optimum impedance may have a negative resistance.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2018. article id AIAA 2018-3777
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-233739DOI: 10.2514/6.2018-3777Scopus ID: 2-s2.0-85051301729ISBN: 9781624105609 (print)OAI: oai:DiVA.org:kth-233739DiVA, id: diva2:1244014
Conference
AIAA/CEAS Aeroacoustics Conference, 2018, Atlanta, United States, 25 June 2018 through 29 June 2018
Note

QC 20180831

Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-08-31Bibliographically approved

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Åbom, MatsBodén, Hans

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