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Article Dans Une Revue Journal of Fluid Mechanics Année : 2023

Reflection and transmission of a Kelvin-Helmholtz wave incident on a shock in a jet

Résumé

Screech tones in supersonic jets are underpinned by resonance between downstreamtravelling Kelvin-Helmholtz waves and upstream-travelling acoustic waves. Specifically, recent works suggest that the relevant acoustic waves are guided within the jet and are described by a discrete mode of the linearised Euler equations. However, the reflection mechanism that converts downstream-travelling waves into upstream-travelling waves, and vice versa, has not been thoroughly addressed, leading to missing physics within most resonance models. In this work we investigate the reflection and transmission of waves generated by the interaction between a Kelvin-Helmholtz wave and a normal shock in an under-expanded jet using a mode-matching approach. Both vortex-sheet and finitethickness shear-layer models are explored, quantifying the impact of the shear layer in the reflection process. This approach could enable more quantitative predictions of resonance phenomena in jets and other fluid systems.
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Dates et versions

hal-03873158 , version 1 (26-11-2022)

Identifiants

Citer

Matteo Mancinelli, Eduardo Martini Vincent Jaunet, Peter Jordan, Aaron Towne, Yves Gervais. Reflection and transmission of a Kelvin-Helmholtz wave incident on a shock in a jet. Journal of Fluid Mechanics, 2023, 954, pp.A9. ⟨10.1017/jfm.2022.991⟩. ⟨hal-03873158⟩
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