저 레이놀즈 수 유동에서 생체모방형 양면 플랩이 적용된 에어포일의 양력 향상에 대한 수치 해석

Abstract

Covert feathers, flexible structures attached to both the upper (suction-side) and lower (pressure-side) surfaces of a bird’s wing, are passively deployed in response to aerodynamic forces and contribute to lift enhancement and stall delay. Despite their functional significance and the influence of their attachment positions, most previous studies on bio-inspired flaps have investigated configurations with flaps on either the suction-side or the pressure-side, without considering their combined aerodynamic effects. In the present study, we perform numerical simulations of a NACA0012 airfoil equipped with flexible flaps on both the suction and pressure sides to explore the aerodynamic performance of dual-side configurations, systematically varying the suction-side (xs) and pressure-side (xp) flap positions. Compared to the clean airfoil, the dual-side flap system provides superior lift enhancement, stemming from the strengthening of primary vortices, the generation of secondary vortices on both sides, and the pressure dam effect induced by the suction-side flap