Aerodynamic performances of Wing-in-Ground-Effect Craft : Effective Airfoil

Abstract

In this paper, the aerodynamic performances of some 2-dimensional Joukowsky airfoils under the ground effect are evaluated through the finite element method analysis. There are derived the effective forms in term of the lift-drag ratio for the wing-in-ground-effect. Especially, the variation of lift-drag ratio depends greatly on the bottom side shapes of the airfoils. The following form of airfoils are selected as the small camber ratio and the thin thickness ratio, which would take in more air flow in the bottom side at small angle of attack.