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Experiments in Fluids

, 60:22 | Cite as

Screech-tone prediction using upstream-travelling jet modes

  • Matteo MancinelliEmail author
  • Vincent Jaunet
  • Peter Jordan
  • Aaron Towne
Research Article
  • 108 Downloads

Abstract

The purpose of this paper is to characterise and model the A1 and A2 screech modes in supersonic jets operating at off-design conditions. The usual screech-modelling scenario involves a feedback loop between a downstream-travelling Kelvin–Helmholtz instability wave and an upstream-travelling acoustic wave. We review state-of-the-art screech-frequency prediction models and associated limitations. Following the work of Edgington-Mitchell et al. (J Fluid Mech 855, 2018), a new prediction approach is proposed where the feedback loop is closed by the upstream-travelling jet modes first discussed in Tam and Hu (J Fluid Mech 201:447–483, 1989) in lieu of the free-stream sound waves. The Kelvin–Helmholtz and upstream-travelling jet modes are obtained using a cylindrical vortex-sheet model. The predictions provide a better agreement with experimental observations than does the classical screech-prediction approach. Screech dynamics associated with the staging process is explored through a wavelet analysis, highlighting that staging involves mutually exclusive switching that is underpinned by non-linear interactions.

Graphical abstract

Notes

Acknowledgements

M. M. acknowledges the support of Centre National d’Études Spatiales (CNES) under a post-doctoral grant.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Département Fluides Thermique et CombustionInstitut Pprime-CNRS-Université de Poitiers-ENSMAChasseneuil-du-Poitou, PoitiersFrance
  2. 2.Direction des LanceursCNESParisFrance
  3. 3.Department of Mechanical EngineeringUniversity of MichiganAnn ArborUSA

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