Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6622
Title: Two-dimensional model of low Mach number vortex sound generation in a lined duct
Authors: Tang, SK 
Lau, CK
Keywords: Acoustic properties
Acoustic wave propagation
Acoustic wave scattering
Amplification
Ducts
Mach number
Porous materials
Vortex flow
Issue Date: Sep-2009
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, Sept. 2009, v. 126, no. 3, p. 1005-1014 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: The soundgenerated by a vortex moving across a duct section lined with porous materials and the corresponding vortex dynamics are studied numerically in the present investigation. The combined effects of the effective fluid density, the flow resistance, the length, and the thickness of the porous linings on the vortex dynamics and sound generation are examined in detail. Results show that stronger sound radiation will take place when the length and the thickness of the porous linings are increased or when the effective fluid density is reduced. The flow resistance can only result in stronger sound radiation within a range whose width depends on the abovementioned system parameters. Such sound amplification cannot be achieved when the initial vortex height gets closer and closer to the duct centerline. The present results also indicate the strong correlation between vortex acceleration and the sound radiation under the actions of the porous linings.
URI: http://hdl.handle.net/10397/6622
ISSN: 0001-4966
DOI: 10.1121/1.3192332
Rights: Copyright 2009 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America.
The following article appeared in Tang, S. K., & Lau, C. K. (2009). Two-dimensional model of low mach number vortex sound generation in a lined duct. Journal of the Acoustical Society of America, 126(3), 1005-1014 and may be found at http://scitation.aip.org/content/asa/journal/jasa/126/3/10.1121/1.3192332.
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