Screech-tone prediction using upstream-travelling jet modes

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. (2018), a new prediction approach is proposed where the feedback loop is closed by the upstream-travelling jet modes first discussed in M. Mancinelli Tam and Hu (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 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 .
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Submitted on : Wednesday, November 6, 2019 - 2:57:25 PM
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Matteo Mancinelli, Vincent Jaunet, Peter Jordan, Aaron Towne. Screech-tone prediction using upstream-travelling jet modes. Experiments in Fluids, Springer Verlag (Germany), 2019, 60 (1), pp.22. ⟨10.1007/s00348-018-2673-2⟩. ⟨hal-02351670⟩



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