Numerical study on the aerodynamic characteristics of two-dimensional ground effect of an anti-s airfoil

Abstract The NACA4412 airfoil is often chosen as the main airfoil profile for ground effect airfoils, which has a large leading-edge radius, large curvature, and flat lower airfoil surface, and has good aerodynamic performance. In this paper, a special “anti-S” airfoil profile is proposed, and an anti-S airfoil, NACAM27, is selected to be compared with the NACA4412 airfoil, which is commonly used in the field of ground effect airfoils, to study the aerodynamic performances of the two airfoils by numerical simulation under different ground effect conditions, and to optimize the better airfoil to obtain the optimal airfoil. Finally, the geostatic stability of the airfoil is analyzed. The results discuss the aerodynamic characteristics of the anti-S airfoil and the NACA4412 under subsonic conditions, the anti-S airfoil has a higher lift-to-drag ratio, and the static stability margin is easier to predict.