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Oscillation Modes in Screeching Jets
KTH, School of Engineering Sciences (SCI), Mechanics. (FLOW)
École Centrale de Lyon, 69134 Ecully Cedex, France.
KTH, School of Engineering Sciences (SCI), Mechanics. (Competence Center for Gas Exchange (CCGEx), FLOW)ORCID iD: 0000-0001-7330-6965
2018 (English)In: AIAA Journal, ISSN 0001-1452, E-ISSN 1533-385XArticle in journal (Refereed) Published
Abstract [en]

Nonideally expanded supersonic jets generate three basic noise components, namely, the turbulent mixing noise, the broadband shock-associated noise, and the screech noise. The mixing noise, obtained for both subsonic and supersonic jets, is most intense in the downstream direction; and it occurs at Strouhal numbers of around 0.15. The broadband shock-associated noise is radiated mainly in the radial direction, and it has a central frequency varying with the emission angle. The screech noise consists of tones measured in the upstream direction. These tones are due to an aeroacoustic feedback mechanism establishing between turbulent structures propagating downstream and acoustic waves propagating upstream.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2018.
Keyword [en]
Supersonic jets; screech noise; origin of the oscillation modes; vortex sheet model; Large Eddy Simulations
National Category
Aerospace Engineering Fluid Mechanics and Acoustics
Research subject
Aerospace Engineering; Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-228596DOI: 10.2514/1.J056936OAI: oai:DiVA.org:kth-228596DiVA, id: diva2:1210459
Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-29Bibliographically approved

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Gojon, Romain

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