Abstract
The two-dimensional flap side-edge flow model developed by Sen (Sen, R., Local Dynamics and Acoustics in a Simple Model of Airfoil Lateral-Edge-Noise, AIAA Paper 96-1673, May 1996) is analyzed to reveal the noise-production potential of the proposed mechanism. The model assumes that a vortex will form at the equilibrium position off the side edge of the flap. The vortex is then perturbed away from the equilibrium position by incoming turbulence, causing it to oscillate and thus radiate sound. The noise field is calculated three-dimensionally by taking the flap to have a finite chord. Spectra and directivity of the far-field sound are presented. In addition, the effect of retarded time differences is evaluated. The parameters in the model are related to typical aircraft parameters and noise reduction possibilities are proposed.
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