Supersonic Cavity Flow Control Using a Spanwise Array of Leading-Edge Tabs

Singh, Surabhi; Ukeiley, Lawrence; Zhang, Yang; Cattafesta, Louis N.; Taira, Kunihiko

doi:10.2514/1.c036678

Cited by 7 publications

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of fluidic spoilers on the acoustic spectrum Previous CFD studies on saw-tooth type spoilers [58 -60] demonstrated that a similar splitting of the shear layer into smaller structures occurred as well. The experimental study of Singh et al [27],…”

Section: Resultsmentioning

confidence: 99%

Hilbert–Huang Spectral Analysis of Cavity Flows Incorporating Fluidic Spoilers

Bacci

Saddington

2023

AIAA Journal

View full text Add to dashboard Cite

Numerical aero-acoustic 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. Results are presented for the acoustic spectrum and further analysis was conducted using the Hilbert-Huang methodology. The fluidic spoilers were able to reduce considerably 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 was altered. The Hilbert-Huang spectral analysis provided an enhanced understanding of the complex nature of the aero-acoustic behavior of the cavity. Acoustic modes were identified that, together with the Rossiter-Heller tones, govern the behavior of the spectrum. This demonstrated how the generated tones, appearing inside the cavity, were a result of complex non-linear 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 modu-

show abstract

Section: Resultsmentioning

confidence: 99%