Unsteady Characteristics of Flows Around an NACA 0012 Airfoil

摘要

Unsteady excitation was generated by a rotating elliptical cylinder located below and behind the airfoil. This produced an unsteady flow of approximately constant phase. Four regions were identified within the unsteady turbulent boundary layer and the viscous sublayer was most affected by the unsteady flow. The velocity phase shift was found to be a function of the reduced frequency of the rotating elliptical cylinder. This phenomena was examined experimentally and analytically.