In order to study the stall characteristics of two-elements wingsail of merchant ships during navigation, the transition SST turbulence model is used to solve the airfoil flow field of two-elements wingsail, and the stall characteristics of two-elements wingsail are analyzed by numerical simulation. It has been found that as the Reynolds number increases, the stall angle of the two-element wingsail airfoil continuously decreases, the angular separation of the suction side trailing edge of the flap disappears, and the fluid flows around the trailing edge of the flap to the pressure surface, interfering with the flow of the pressure surface fluid and causing flow separation at the trailing edge of the pressure surface. It has adverse effects on the safety of the sail structure and the stable operation of the ship.
Yuan et al. (Sun,) studied this question.