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Assessment of Surface Roughness for a 'Silent' Aircraft

Liu, Y (2013) Assessment of Surface Roughness for a 'Silent' Aircraft The Aeronautical Journal, 117 (1189). pp. 283-298.

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Abstract

Boundary-layer noise produced by rough surfaces is a potential contributor to airframe noise. In this paper, an attempt is made to assess the surface roughness noise for a conceptual Silent Aircraft design SAX-40 using a prediction model described in previous theoretical work (Liu & Dowling, AIAA J. 45(4), pp. 855-869, 2007). Estimates of three idealised test cases show that surface roughness could produce a relatively high noise level and enhance the trailing-edge noise somewhat. Roughness height and roughness density are two significant parameters which affect surface roughness noise, with roughness height having the more dominant effect. The distribution of roughness noise sources decreases in the streamwise direction on the SAX-40 surface. Two candidate rough surfaces are selected for SAX-40 to keep surface roughness noise at a negligible level and to meet an aggressive noise target.

Item Type: Article
Authors :
AuthorsEmailORCID
Liu, YUNSPECIFIEDUNSPECIFIED
Date : 2013
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 28 Mar 2017 13:46
Last Modified : 28 Mar 2017 13:46
URI: http://epubs.surrey.ac.uk/id/eprint/764439

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