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Waves in screeching jets

Published online by Cambridge University Press:  22 February 2021

Daniel Edgington-Mitchell Open the ORCID record for Daniel Edgington-Mitchell [Opens in a new window] ,
Tianye Wang ,
Petronio Nogueira Open the ORCID record for Petronio Nogueira [Opens in a new window] ,
Oliver Schmidt Open the ORCID record for Oliver Schmidt [Opens in a new window] ,
Vincent Jaunet Open the ORCID record for Vincent Jaunet [Opens in a new window] ,
Daniel Duke Open the ORCID record for Daniel Duke [Opens in a new window] ,
Peter Jordan Open the ORCID record for Peter Jordan [Opens in a new window]  and
Aaron Towne Open the ORCID record for Aaron Towne [Opens in a new window]
Daniel Edgington-Mitchell*
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
Tianye Wang
Affiliation:
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
Petronio Nogueira
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
Oliver Schmidt
Affiliation:
Department of Mechanical and Aerospace Engineering, University of California San Diego, La Jolla, CA 92093, USA
Vincent Jaunet
Affiliation:
Department Fluides, Thermique, Combustion, Institut PPRIME, CNRS - Universite de Poitiers, ENSMA, UPR 3346, 86036 Poitiers, France
Daniel Duke
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
Peter Jordan
Affiliation:
Department Fluides, Thermique, Combustion, Institut PPRIME, CNRS - Universite de Poitiers, ENSMA, UPR 3346, 86036 Poitiers, France
Aaron Towne
Affiliation:
Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
*
†Email address for correspondence: daniel.mitchell@monash.edu
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Abstract

The interaction between various wave-like structures in screeching jets is considered via both experimental measurements and linear stability theory. Velocity snapshots of screeching jets are used to produce a reduced-order model of the screech cycle via proper orthogonal decomposition. Streamwise Fourier filtering is then applied to isolate the negative and positive wavenumber components, which for the waves of interest in this jet correspond to upstream- and downstream-travelling waves. A global stability analysis on an experimentally derived base flow is conducted, demonstrating a close match to the results obtained via experiment, indicating that the mechanisms considered here are well represented in a linear framework. In both the global stability analysis and the experimental decomposition, three distinct wave-like structures are evident; these waves are also solutions to the cylindrical vortex-sheet dispersion relation. One of the waves is the well-known downstream-travelling Kelvin–Helmholtz mode. Another is the upstream-travelling guided jet mode that has been a topic of recent discussion by a number of authors. The third component, with positive phase velocity, has not previously been identified in screeching jets. Via a local stability analysis, we provide evidence that this downstream-travelling wave is a duct-like mode similar to that recently identified in high-subsonic jets. We further demonstrate that both of the latter two waves are generated by the interaction between the Kelvin–Helmholtz wavepacket and the shock cells in the flow. Finally, we consider the periodic spatial modulation of the coherent velocity fluctuation evident in screeching jets, and show that this modulation can be at least partially explained by the superposition of the three wave-like structures, in addition to any possible modulation of the Kelvin–Helmholtz wavepacket by the shocks themselves.

JFM classification

Acoustics: Aeroacoustics Wakes/Jets: Jets Acoustics: Jet noise

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JFM Papers
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Journal of Fluid Mechanics , Volume 913 , 25 April 2021 , A7
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© The Author(s), 2021. Published by Cambridge University Press

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References

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