Vortex sound in the presence of a low Mach number flow across a drum-like silencer

Tang, S. K.

Abstract

The sound generated by a vortex propagating across a two-dimensional duct section with flexible walls (membranes) in an infinitely long rigid duct conveying a flow is investigated numerically using the matched asymptotic expansion technique and the potential theory. The effects of the initial vortex position, the mechanical properties of the flexible walls, and the mean flow on the sound generation are examined in detail. Results show that the presence of a vortex inside a uniform mean flow can strengthen or attenuate the sound generation, depending on the phase of the membrane vibration when the vortex starts vigorous interaction with the membranes and the strength of the mean flow. The results tend to imply that there is a higher chance of sound amplification when a vortex stream is moving closer to the lighter membrane under a relatively strong mean flow or when the mean flow is weak. The chances of sound amplification or attenuation are equal otherwise. © 2011 Acoustical Society of America.

Citation

Tang, S. K. (2011). Vortex sound in the presence of a low Mach number flow across a drum-like silencer. The Journal of the Acoustical Society of America, 129(5), 2830-2840. https://doi.org/10.1121/1.3562567

• Journal Article Type: Article
• Acceptance Date: Feb 16, 2011
• Online Publication Date: May 10, 2011
• Publication Date: May 1, 2011
• Deposit Date: Jul 11, 2022
• Journal: Journal of the Acoustical Society of America
• Print ISSN: 0001-4966
• Publisher: Acoustical Society of America
• Peer Reviewed: Peer Reviewed
• Volume: 129
• Issue: 5
• Pages: 2830-2840
• DOI: https://doi.org/10.1121/1.3562567
• Keywords: Acoustical properties, Musical instruments, Sound generation, Structural plate vibrations, Rigid body dynamics, Asymptotic analysis, Potential theory, Fluid dynamics, Quasi one dimensional flows, Vortex dynamics
• Public URL: https://hull-repository.worktribe.com/output/4016021