Whistling of deep cavities subject to turbulent grazing flow: intermittently unstable aeroacoustic feedback

• Published in: Journal of fluid mechanics Vol. 909
• Main Authors: Bourquard, Claire, Faure-Beaulieu, Abel, Noiray, Nicolas
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 25.02.2021
• Subjects: Acoustic noise; Acoustics; Aeroacoustics; Aerodynamics; Amplitudes; Bifurcations; Cavities; Colour; Combustion chambers; Computational fluid dynamics; Control theory; Coupling; Damping; Differential equations; Electric power generation; Feedback; Fixed points (mathematics); Flow generated vibrations; Flow stability; Flow velocity; Fokker-Planck equation; Grazing; Grazing flow; Holes; Hopf bifurcation; Instability; Investigations; JFM Papers; Mathematical models; Oscillations; Oscillators; Probability density functions; Probability theory; Shear layers; Simulation; Stability analysis; Turbulence; Turbulent flow; Vibration; Vortices; aeroacoustics; bifurcation; intermittency

In this work, the classic problem of the aeroacoustic instability occurring in deep cavities subject to a low-Mach grazing flow is revisited experimentally and theoretically. This instability is caused by the constructive feedback between the acoustic modes of the cavity and the turbulent shear laye...