Aerodynamic analysis of the boundary layer region of symmetric airfoils at ground proximity

In this paper, effects of flight altitude from ground surface and the thickness of the airfoils moving at ground proximity on the inception point of the transition phenomenon, the start of flow separation, and the boundary layer thickness have been analyzed. The amounts of drag force as well as the lift of the airfoil in viscous flows are influenced by these parameters. Included in this study are the effects of change in Reynolds number and angle of attack on the symmetric airfoils which are carefully investigated. Results of this aerodynamic analysis indicate that the motion at ground proximity is the cause of some changes in boundary layer properties. By close scrutiny of these changes, justifications are found for the behavior of the lift and drag forces at ground proximity.