Abstract
A two-dimensional numerical study was performed to investigate the acoustic effects of micro-tab device on airframe noise reduction. As the noise generated by leading-edge slat and trailing-edge flap rise with their increased deflection angles, it is possible to mitigate such high-lift noise by using reduced settings without sacrificing the aerodynamic performance during approach. In this paper, micro-tab device attached to the pressure side of the flap surface is envisioned as a mean to achieve this goal. Hybrid method involving Computational Fluid Dynamics and acoustic analogy was used to predict the far-field noise spectrum. Results illustrate that the micro-tab device with reduced deflection angles of the high-lift settings provides lower noise signature at far-field positions, comparing to the baseline configuration, while the aerodynamic performance is maintained. In addition, some parametric studies including the tab location and the variation in angle of attack were also investigated.
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