風車尾翼の最適形状

抄録

An investigation of 8 kinds of wings was mad in the wind tunnel of the mechanical engineering laboratory around the practical range of Reynolds Number, in order to determine the optimum shapes suitable for the tail-wings of small-scale wind turbines out of a number of various shapes practically used in the world. As the wind changes direction more than 20 degrees instantaneously, often 30 or 40 degrees an optimum tail-wing must have such characteristics that keep the high-lift coefficient in the region of large angles of attack, preventing itself from falling in a stall. A coefficient of yaw-control force, acting on the tail-wing perpendicular to its surface, was defined to compare the characteristics of the wings as tail-wings. It is concluded that the wings of an aspect ratio of 1.5-0.7 are superior to those of a large aspect ratios.