Flap Side-Edge Noise: Acoustic Analysis of Sen's ModelThe two-dimensional flap side-edge flow model developed by Sen 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 farfield 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.
Document ID
19960023554
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Hardin, Jay C. (NASA Hampton, VA United States)
Martin, James E. (Christopher Newport Coll. Newport News, VA United States)