Hilbert–Huang spectral analysis of cavity flows incorporating fluidic spoilers

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dc.contributor.authorBacci, David
dc.contributor.authorSaddington, Alistair J.
dc.date.accessioned2022-10-10T13:54:44Z
dc.date.available2022-10-10T13:54:44Z
dc.date.issued2022-10-07
dc.description.abstractNumerical aeroacoustic analysis was conducted on an M219 cavity geometry, incorporating signature suppression features and leading-edge fluidic spoilers. The numerical model was validated against existing experimental data. The palliative properties of fluidic spoilers were investigated at Mach numbers of 0.85, 1.20, and 1.80 with blowing coefficients of 0.03 and 0.06. The results are presented for the acoustic spectrum, and further analysis was conducted using the Hilbert–Huang methodology. The fluidic spoilers were able to considerably reduce the overall level of acoustic noise and to reduce and/or suppress the resonant modes typical of cavity flows. The effectiveness of the spoilers was a direct consequence of their effect on the detached shear layer, of which the trajectory and coherence were altered. The Hilbert–Huang spectral analysis provided an enhanced understanding of the complex nature of the aeroacoustic behavior of the cavity. Acoustic modes were identified that, together with the Rossiter–Heller tones, governed the behavior of the spectrum. This demonstrated how the generated tones, appearing inside the cavity, were a result of complex nonlinear interactions between shear-layer acoustic instabilities and centrifugal instabilities originating in the flow recirculating in the internal part of the cavity. This also demonstrated that the fundamental frequencies had frequency and amplitude modulation characteristics that spread the energy in a wide bandwidth. This is not captured by classical Fourier analysis.en_UK
dc.identifier.citationBacci D, Saddington AJ. (2023) Hilbert–Huang spectral analysis of cavity flows incorporating fluidic spoilers. AIAA Journal, Volume 61, Issue 1, January 2023, pp. 217-284en_UK
dc.identifier.issn0001-1452
dc.identifier.urihttps://doi.org/10.2514/1.J061917
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/18540
dc.language.isoenen_UK
dc.publisherAIAAen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectcavityen_UK
dc.subjectaeroacousticen_UK
dc.subjecttransonicen_UK
dc.subjectsupersonicen_UK
dc.subjectfluidicen_UK
dc.subjectspoileren_UK
dc.titleHilbert–Huang spectral analysis of cavity flows incorporating fluidic spoilersen_UK
dc.typeArticleen_UK

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