Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/106442
Title: | Acoustic impedance of micro-perforated panels in a grazing flow | Authors: | Zhang, X Cheng, L |
Issue Date: | Apr-2019 | Source: | Journal of the Acoustical Society of America, Apr. 2019, v. 145, no. 4, p. 2461-2469 | Abstract: | Micro-perforated panels (MPPs) are widely used for broadband sound absorptions. For a MPP exposed to a grazing flow, existing acoustic impedance formulas based on different flow parameters give inconsistent results, thus calling for a systematic investigation of the issue to find more intrinsic flow parameters allowing for a reliable acoustic impedance prediction. In this study, three-dimensional CFD simulations are conducted on a MPP hole with a backing space in a flow duct. Numerical results allow identifying the flow velocity gradient in the viscous sublayer as the intrinsic flow parameter and show its linear relationship with a flow-related term in the acoustic resistance formula. Through a linear regression analysis, an acoustic resistance formula is established within a certain flow range (Mach number up to 0.25) under the linear acoustic regime. The validity of the impedance formula is demonstrated through comparisons with existing results and experimental data reported in the literature, showing good agreement and superiority in terms of the prediction accuracy. | Publisher: | AIP Publishing LLC | Journal: | Journal of the Acoustical Society of America | ISSN: | 0001-4966 | EISSN: | 1520-8524 | DOI: | 10.1121/1.5098785 | Rights: | © 2019 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 Xiaoqi Zhang, Li Cheng; Acoustic impedance of micro-perforated panels in a grazing flow. J. Acoust. Soc. Am. 1 April 2019; 145 (4): 2461–2469 and may be found at https://doi.org/10.1121/1.5098785. |
Appears in Collections: | Journal/Magazine Article |
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2461_1_online.pdf | 2.1 MB | Adobe PDF | View/Open |
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