Effects of compliant coatings on radiated sound from a rigid-wall turbulent boundary layer
نویسنده
چکیده
A theoretical model is developed to investigate the effect of compliant coatings on radiated sound from low Mach-number turbulent boundary layers over otherwise rigid surfaces. Lighthill’s analogy is employed and the primary noise source is assumed to be from wall-pressure fluctuations. Parametric studies are performed on the behavior of the material properties such as the speed of sound and density of compliant coatings. Comparisons are made between the results from coated and uncoated rigid walls. At low frequencies, compliant coatings are not effective for noise reduction. At high frequencies, coating materials with low speed of sound and low density provide significant noise reduction. r 2004 Elsevier Ltd. All rights reserved. rs n l c op y
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