Lift augmentation of a circulation control airfoil in proximity to water waves

Abstract Wave is an important factor affecting the takeoff and landing of seaplanes. In order to study the effect of waves on the moving airfoil in proximity to the water surface, the influence of different wave parameters on the aerodynamic characteristics of the airfoil is investigated through numerical simulation by solving the Reynolds-averaged Navier-Stokes equations. Moreover, the lift-augmentation effect of constant blowing on the circulation control airfoil in proximity to water waves is investigated. The results show that the higher the wave height and the longer the wavelength, the larger the fluctuation amplitude of the lift coefficient of the airfoil. the lift-augmentation efficiency of the circulation control airfoil decreases significantly after the blowing momentum coefficient exceeds a certain value. When the airfoil is close to water waves, the increase of the blowing momentum coefficient not only augments the lift of the circulation control airfoil, but also aggravates the fluctuation of the lift force.