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Linear dynamics of over-expanded annular supersonic jets

Published online by Cambridge University Press:  07 May 2025

Vincent Jaunet Open the ORCID record for Vincent Jaunet [Opens in a new window]  and
Guillaume Lehnasch
Vincent Jaunet*
Affiliation:
ISAE-ENSMA, Institut PPrime, Université de Poitiers, UPR-3346 CNRS, 1 Avenue Clement Ader, 86360 Chasseneuil-du-Poitou, France
Guillaume Lehnasch
Affiliation:
ISAE-ENSMA, Institut PPrime, Université de Poitiers, UPR-3346 CNRS, 1 Avenue Clement Ader, 86360 Chasseneuil-du-Poitou, France
*
Corresponding author: Vincent Jaunet, [email protected]
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Abstract

This article delves into the dynamics of inviscid annular supersonic jets, akin to those exiting converging–diverging nozzles in over-expanded regimes. It focuses on the first azimuthal Fourier mode of flow fluctuations and examines their behaviour with varying mixing layer parameters and expansion regimes. The study reveals that two unstable Kelvin–Helmholtz waves exist in all cases, with the outer-layer wave being more unstable due to differences in the velocity gradient. The inner-layer wave is more sensitive to changes in base flow and extends beyond the jet, potentially contributing to nozzle resonances. The article also investigates upstream propagating guided-jet modes, which are found to be robust and not highly sensitive to changes in base flow, which makes them essential for understanding jet dynamics. A simplified model is used to obtain ideal base flows but with realistic shape in order to study the effects of varying nozzle pressure ratios on the dynamics of the waves supported by the jet.

JFM classification

Compressible Flows: Supersonic flow Wakes/Jets: Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1009 , 25 April 2025 , A32
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Copyright
© The Author(s), 2025. Published by Cambridge University Press

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