An aerodynamic and aeroacoustics optimization design method for high-lift airfoils is established. The optimization design method integrated the parameterized geometric model, mesh generation, CFD computation and far field noise prediction technique. The optimization design based on a genetic algorithm (GA) is accomplished for multi-element airfoil. The 30P30N three-element high-lift airfoil is selected as the baseline airfoil and optimized in aerodynamic and aeroacoustics. The location and orientation parameters of the slat relative to the main wing, defined by deflection angle, overlap and gap, are optimized to obtain the maximum lift coefficient which can be calculated by CFD and minimum radiated noise level. The physics-based slat noise model proposed by Guo is applied to predict the high-lift far field noise level. The optimized three-element airfoil is proved to have a better aerodynamic performance and the minimum of the noise level is obtained.
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