An experimental investigation on the use of specific surface treatments, called finlets, was performed to achieve noise reduction at the trailing edge of a flat plate. For the first time, comprehensive measurements, such as surface static and dynamic pressure measurements, carried out in the space between the finlets, are presented. These provide further understanding of the flow dynamics and their correlation with the noise reduction at the trailing edge. Moreover, with an ultimate goal of effective and efficient application of finlets in commercial aviation, configurable parameters such as treatment position, finlet spacing and finlet profile shape were considered and their effects on the flow physics and noise reduction examined. In doing so, the effects of finlet application on turbulent structures in the boundary layer were investigated. The results show that when the turbulent structures were allowed to be convected some distance after leaving the finlets, they were less effective in noise production through trailing-edge scattering. Furthermore, it was observed that a variation of the finlet profile shape can improve the efficiency of the treatment in reducing the surface pressure fluctuation power spectral density, but at the same time is likely to lead to an increase of the finlet self-noise.
|Publication status||E-pub ahead of print - 8 Jun 2020|
|Event||AIAA Aviation Forum 2020 - Online, United States|
Duration: 15 Jun 2020 → 19 Jun 2020
|Conference||AIAA Aviation Forum 2020|
|Period||15/06/20 → 19/06/20|