ایرفویل

ایرفویل

اسلاید 1: ME403 Chapter 22D Airfoil AerodynamicsLift is mainly provided by the wing with an airfoil cross-section shape

اسلاید 2: Airfoil GeometryAn airfoil is the 2D cross-section shape of the wing, which creates sufficient lift with minimal drag

اسلاید 3: Historical Airfoils

اسلاید 4: Historical Airfoils

اسلاید 5: Typical StreamlinesAngle of Attack

اسلاید 6: Pressure Distribution

اسلاید 7: Pressure Coefficient Distribution In free-stream: At stagnation point (V=0): Positive Cp means the pressure is higher than the free-stream (atmospheric) pressure, and negative Cp means suction relative to free-stream pressure. The maximum, which occurs at the stagnation point, is always 1.

اسلاید 8: Viscous Boundary LayerVelocity profile creates skin friction (shear) drag on surface

اسلاید 9: Curve fit formula for turbulent boundary layer (Re > 500,000):Flat Plate Skin Friction Drag Coefficient