Study of the planform of wing flow visualization around new high lift devices.

High lift devices of airplane have been studied mainly for the airfoil and applied to actual airplanes. However, except very high-aspect-ratio wing, the planform of wing is also strongly contributive to the stall characteristics of the wing.This study is to find better planform as well as better airfoil to get more aerodynamic forces(lift and drag) than the existing ones by changing not only the sectional profile of airfoil but also the planform of wing. The devices mainly. in addition to the existing flaps, consist of a set of wider slat and root flaps like strake which generates strong longitudinal vorticies and thus stablizes the flow around the wing at high angle of attack. Newly developed devices can also increase the drag coefficient as well as the lift coefficient and thus decrease the flight speed of airplane in landing approach. The flow vizualiza-tion by means of taft attached on the wing and smoke lines of paraffin mist Is helpful to this study for understanding the effect of the devices on the partly separated flow around the wing.