Modelling jet-surface interaction noise from cranked wings

Dawson, Martin, Lawrence, Jack, Self, Rodney and Kingan, Michael (2020) Modelling jet-surface interaction noise from cranked wings. In AIAA Aviation 2020 Forum. (doi:10.2514/6.2020-2551).

Abstract

A strip implementation of Amiet’s theory has been used to model the jet-surface interaction noise produced by the cranked wing geometry seen on commercial jet airliners. Because it is the geometry that has changed between strips, not the incident pressure, the noise produced by each strip has been summed coherently. This coherent addition has been verified as converging on the infinite-span solution as the number of strips is increased, and to equal that of a single strip of the same overall span. Jet-surface interaction noise predictions from both strip and infinite-span implementations of Amiet’s theory have been validated against installed jet noise measurements with a low aspect ratio plate. The finite span implementation shows an improvement in spectra at low frequencies, however, it under-predicts at azimuthal observer angles near the plane of the plate. Finally, the OASPL directivity of a cranked wing has been calculated both using strip theory and assuming infinite span (both swept and unswept). Of the three, the strip theory model agrees best with the measured data.

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