AIR RESISTANCE OF THE AERODYNAMIC BRAKE ON A GYRO-MILL TYPE VERTICAL AXIS WIND TURBINE

Abstract

An aerodynamic brake which uses air resistance to suppress the rotational speed as the rotational speed increases is properly attached to the vertical axis of a gyro-mill type experimental wind turbine. It is revealed that this aerodynamic brake can widen the range of wind speeds under which the turbine can be safely operated. In this study, brake plates with different turning radii are attached to an experimental gyro-mill type wind turbine, the air resistance at each rotational speed is measured, and the adaptability to the wind turbine is evaluated