Combined translation/pitch motion - A new airfoil dynamic stall simulation

Abstract

The effects of simultaneous velocity and incidence fluctuations on the 2-D aerodynamic behaviour of a NACA 0012 airfoil are investigated in this paper. A new mechanical system allows driving the airfoil in pitching and in fore and aft motions, as well as in a simultaneous combination of these two basic unsteady motions. In response to the simultaneous velocity and incidence variations, the time-dependent lift and drag fluctuations are measured for increasing values of the reduced frequency and amplitude parameters, including dynamic stall conditions. Complementary information on the dynamic stall occurring in combined motion is provided by skin friction and pressure measurements along the airfoil surface.