抄録
The surface flow on rotor blade of Horizontal Axis Wind Turbine (HAWT) has complicated three-dimensional flow with span-wise velocity. Detail of flow around rotor blades are not clarified sufficiently, since the measurement of velocity including boundary layer on rotor blades are difficult to reveal precisely. This paper's aim is to clarify the flow field around wind turbine blades. As the method, the measurement was performed on a model wind turbine having three blades by using of Laser Doppler Velocimeter (LDV) in wind tunnel. This paper showed that two-dimensional relative velocity in the boundary layer outer edge accelerate in the blade leading edge, in the region of the boundary layer from the outer edge to the blade surface the flow on the rotor blade surface is decelerating toward the trailing edge from the blade middle part due to the influence of the adverse pressure gradient and three-dimensional flow in the blade root area is stronger than the blade tip area.
