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Optimum Impedance in the Presence of an Inviscid Sheared Flow
Univ Fed Santa Catarina, Dept Mech Engn, BR-88040900 Florianopolis, SC, Brazil.;Univ Fed Santa Catarina, Acoust & Vibrat Lab, BR-88040900 Florianopolis, SC, Brazil..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
Univ Fed Santa Catarina, Dept Mech Engn, BR-88040900 Florianopolis, SC, Brazil.;Univ Fed Santa Catarina, Acoust & Vibrat Lab, BR-88040900 Florianopolis, SC, Brazil..
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
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2019 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385X, Vol. 57, no 3, p. 1044-1054Article in journal (Refereed) Published
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 for a given frequency, Mach number, and azimuthal mode order). Although such analysis can be carried out by means of numerical simulations, analytical expressions can also be derived to predict the optimum impedance. Previous works have been concerned with the optimum impedance of higher-order modes in rectangular ducts with uniform flow. In this work, the analysis is expanded to circular ducts for both uniform and sheared inviscid flows. Focus is given to typical operating conditions found in turbofan engine intakes and vehicle exhaust systems. 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
AMER INST AERONAUTICS ASTRONAUTICS , 2019. Vol. 57, no 3, p. 1044-1054
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246241DOI: 10.2514/1.J057526ISI: 000459609400014OAI: oai:DiVA.org:kth-246241DiVA, id: diva2:1302104
Conference
24th AIAA/CEAS Aeroacoustics Conference / AIAA/CEAS Aeronautics Conference, JUN 25-29, 2018, Atlanta, GA
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved

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Zhang, ZheÅbom, MatsBodén, Hans

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