フィールド実験による直線翼垂直軸風車の後流範囲に関する研究

抄録

In this study, field experiments were conducted with the aim of clarifying the range of influence of the wake of a straight-blade vertical axis wind turbine under unsteady natural wind conditions. In the experiment, a test vertical axis wind turbine with a rotor diameter of 2 m and a bladespan of 1.2 m was operated and the wake of the wind turbine was observed up to 3 times the diameter of the rotor. The wind direction and the wind speed distributions in the wake was investigated using three-dimensional ultrasonic anemometers installed in the downstream area. The spatially discrete wind directions and wind speeds obtained in this field experiment were quantitatively evaluated by a wake model expressed in a Cartesian coordinate system. In addition, each parameter value of the wake model was expressed as a function with the wake position, and the range of influence of the wake of the vertical axis wind turbine was estimated. As a result of the experiment, the asymmetry of the wake of the vertical axis wind turbine was confirmed, and the wake recovery distance for each peripheral speed ratio could be obtained.