| Citation: | HAO Lishu, ZHANG Zhihao, YANG Bojian, et al. Investigation on the effect of airfoil aerodynamic performance with bionic flap[J]. Journal of Aerospace Power, 2025, 40（11）：20230782 doi: 10.13224/j.cnki.jasp.20230782
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Considering the phenomenon that bird’s feathers on the wing are slightly raised when birds are landing, a series of small flaps with different configurations were arranged on the seagull bionic airfoil. The investigation on the effect of airfoil aerodynamic performance with bionic flap was studied by using computational fluid dynamics (CFD) method. The effects of flap shape, flap gap height, flap angle and laminated flap on the airfoil aerodynamic performance were discussed, and the effect of bionic flap on flow separation was analyzed by streamline, pressure distribution curve and vortex field. The results showed that the bionic flap can improve the stall characteristics of the airfoil within a limited range of angle of attack, leading to the increase of lift and the decrease of pressure drag. The angle and shape of the flaps were key factors to improve the aerodynamic characteristics of the airfoil, while the gap height of the flaps and the laminated configuration had weaker control over the separation flow. Among all the 11 flap configurations, seagull flap configuration had the strongest ability to improve the airfoil stall characteristics, its maximum lift coefficient can be increased by 15.4%, and the effective angle of attack range for improving the airfoil stall characteristics can reach more than 8°. The above research results also confirmed the aerodynamic reasons for raising feathers during the bird’s landing flight, and the key parameters to improve the stall characteristics of the airfoil were obtained, which can provide data and theoretical support for subsequent engineering application of the bionic airfoil.
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