Application of Viscothermal Wave Propagation Theory for Reduction of Boundary Layer Induced Noise

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Wijnant, Y.H. and Hannink, M.H.C. and Boer, A. de (2003) Application of Viscothermal Wave Propagation Theory for Reduction of Boundary Layer Induced Noise. In: 5th European Conference on Noise Control, Euronoise, May 19-21, 2003, Naples, Italy.

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Abstract:Boundary layer induced noise, i.e. noise inside the aircraft resulting from the turbulent boundary layer enclosing the fuselage, is known to dominate air-cabin noise at cruise conditions. In this paper a method is described to design trim panels containing a large number of coupled tubes to effectively reduce this type of noise. The theory of viscothermal wave propagation in tubes, as presented by Tijdeman [3], is discussed. To illustrate the procedure the absorption coefficient for a panel containing a number of non-coupled tubes is calculated. Initial results optimising the tubes’ length and radii for a desired fictive absorption coefficient are presented and prove the applicability of the method.
Item Type:Conference or Workshop Item
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Engineering Technology (CTW)
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Link to this item:http://purl.utwente.nl/publications/58837
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