Abstract
Lift and drag of a symmetric airfoil with miniature electromagnetic actuators have been measured in the low Reynolds number region from 30,000 to 100,000. The effect of the operation of the actuators has also been demonstrated under the condition that a wind speed has suddenly been decreased and that should have leaded to the stall if no-actuation. It was found that both of the coefficient of the maximum lift and the stall angle of attack increased as the Reynolds number was increased. The actuation made the coefficient of the maximum lift and the stall angle of attack larger than those in the no-actuation case for each Reynolds number. Even in the case of the wind speed decrease, it was demonstrated that the actuation was effective to avoid the stall and to keep the high lift equivalent to each wind speed. Feedback control using increase/decrease of angle of attack was also effective to maintain the high lift in the case of the wind speed decrease and the additional feedback operation of actuators worked well to suppress the abrupt decrease of the lift.
