Aerodynamic Design of the Civil Aircraft with Sealed Leading Edge Slat

Study of the aerodynamic design of leading edge slat in civil aircraft was carried out. Two types of slat were studied. The takeoff configurations have two types of slat and aerodynamic shape. One was the slat with no gap between fixed wing and slat, another was the slat with gap between fixed wing and slat. Aerodynamic design was carried out. Numerical simulation and wind tunnel test were applied to obtain the aerodynamic characteristics, results show that: the takeoff configuration with sealed slat has better lift-to-drag ratio than the configuration with unsealed slat. The configuration with unsealed slat has higher maximum lift coefficient than the configuration with sealed slat, the takeoff configurations with different slats have the same stalling angle of attack.