![symmetric airfoil symmetric airfoil](https://cdnsciencepub.com/cms/10.1139/tcsme-2017-0105/asset/images/large/tcsme-2017-0105f9.jpeg)
There is therefore an increasing interest to understand the aerodynamics of the flapping wing by experimental and numerical methods. Since the Micro Air Vehicle (MAV) was generally defined by the Defense Advanced Research Projects Agency (DARPA) in 1997, the Flapping Wing MAV (FWMAV) has been receiving more and more attention from military and civilian application domains. As the maximum thickness location moves towards the leading edge, the airfoil obtains a larger time-averaged thrust coefficient and a higher propulsive efficiency without changing the lift coefficient. The increase of the maximum thickness can enhance the time-averaged thrust coefficient and the propulsive efficiency without lift reduction. Under specified plunging kinematics, it is observed that the increase of an airfoil thickness can reduce the leading edge vortex (LEV) in strength and delay the LEV shedding. The “class function/shape function transformation“ parametric method was employed to decide the coordinates of these altered NACA0012 airfoils.
#SYMMETRIC AIRFOIL SERIES#
In order to investigate the impact of airfoil thickness on flapping performance, the unsteady flow fields of a family of airfoils from an NACA0002 airfoil to an NACA0020 airfoil in a pure plunging motion and a series of altered NACA0012 airfoils in a pure plunging motion were simulated using computational fluid dynamics techniques.