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Recent development in the cremer impedance: concept extension, experimental analysis and numerical validation
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics.
KTH, Superseded Departments (pre-2005), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0001-7898-8643
KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Vehicle Engineering and Solid Mechanics.ORCID iD: 0000-0002-8474-8563
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2019 (English)In: 25th AIAA/CEAS Aeroacoustics Conference, 2019, [publishername] American Institute of Aeronautics and Astronautics Inc, AIAA , 2019Conference paper, Published paper (Refereed)
Abstract [en]

Recent development in the Cremer impedance concept is summarized in this paper. To begin with, the so-called ‘exact’ Cremer impedance or solution for single-lined rectangular ducts that is ‘exact’ in the low frequency range is derived and experimentally analyzed. The ‘plug’ flow assumption is used in the derivation. Surprisingly, the exact solution has a negative real part in the low frequency range. To investigate the validity of the low frequency result, especially the negative resistance, two numerical analyses are carried out. The effect of boundary layers on the Cremer impedance and the low frequency merging patterns are investigated. In addition, the concept is further extended to double-lined rectangular ducts.

Place, publisher, year, edition, pages
[publishername] American Institute of Aeronautics and Astronautics Inc, AIAA , 2019.
Keywords [en]
Aeroacoustics, Boundary layers, Exact solution, Experimental analysis, Low frequency range, Low-frequency, Numerical validations, Real part, Rectangular ducts, Ducts
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-268448DOI: 10.2514/6.2019-2467Scopus ID: 2-s2.0-85079472893ISBN: 9781624105883 (print)OAI: oai:DiVA.org:kth-268448DiVA, id: diva2:1426117
Conference
25th AIAA/CEAS Aeroacoustics Conference, 2019, 20 May 2019 through 23 May 2019
Note

QC 20200423

Available from: 2020-04-23 Created: 2020-04-23 Last updated: 2020-04-23Bibliographically approved

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Zhang, ZheÅbom, MatsBodén, Hans

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