Understanding twin-jet screech using a vortex-sheet model

Michael N. Stavropoulos, Matteo Mancinelli, Peter Jordan, Vincent Jaunet, Daniel M. Edgington-Mitchell, Petrônio A.S. Nogueira

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

5 Citations (Scopus)

Abstract

A twin-jet vortex-sheet model is applied to study the axisymmetric screech modes, generated by simply converging nozzles, for low supersonic Mach numbers. This allows for the identification of the different waves supported by the flow for different conditions. Propagative regions for the upstream-propagating neutral guided jet mode are observed to vary both as a function of solution symmetry, SS and SA, and the jet separation, whilst bounding the screech tones. The A1 screech mode is observed to be cut-off sharply by the SS lower bound. Screech frequency predictions are performed using the wavenumbers obtained from the vortex-sheet model, which provided a good qualitative agreement with the experimental data. Additional A1 and A2 screech tones were observed in the acoustic spectrum as the jet separation was increased, pointing to the existence of new resonance cycles associated with the different symmetries of the flow. These additional tones exist simultaneously and are seen to merge together as increases leaving only a single A1 and A2 tone.

Original languageEnglish
Title of host publicationAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
PublisherAmerican Institute of Aeronautics and Astronautics
ISBN (Print)9781624106101
DOIs
Publication statusPublished - 2021
EventAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021 - Online, United States of America
Duration: 2 Aug 20216 Aug 2021
https://arc.aiaa.org/doi/book/10.2514/MAVIAT21 (Website)

Conference

ConferenceAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
Abbreviated titleAIAA 2021
Country/TerritoryUnited States of America
Period2/08/216/08/21
Internet address

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