Experimental Study on the Enhancement of Blowing Lift of a Near-Wave Water Wing

The aerodynamic characteristics of amphibious aircraft in real wind and wave conditions are studied. An experimental investigation of jet lift control on airfoil in near-wave water is conducted. The novel wind-water tunnel testing methods are proposed. The study focuses on the aerodynamic performance of the basic airfoil, the lift enhancement performance of the jet, and ground/water surface effects. The results show that flap jet flow significantly increases the lift coefficient of the airfoil. When Cμ = 0.024, the lift increase is equal to approximately 48.3%. As compared to steady jet flow, unsteady pulsed jet flow has the greater lift enhancement potential, with a lift increase of about 32.5% at Cμ = 0.015. The dimensionless wave height A1 in the range from 0.653 to 0.928 results in a smoother stall characteristic compared to A1 = 0.307. The higher wave motion adversely affects the lift enhancement of the airfoil under jet control.