風力発電用風車に作用する風力特性

概要

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In this paper we describe the characteristics of wind forces acting on a propeller-type wind turbinewith three blades. The wind forces were investigated using wind tunnel tests. The test parameterswere wind tunnel flow (uniform flow and uniform turbulent flow), pitch angle of the blades,stationary blade positions and tip speed ratio. The following results were obtained. First, the meandrag coefficients acting on the stationary wind turbine at a position where one blade correspondedto a tower were differed from those at the other blade positions. Next, the mean drag coefficients(thrust coefficients) acting on a rotating wind turbine increased as the tip speed ratio increased, andas the pitch angle decreased. The mean drag coefficients in the uniform turbulent flow were largerthan those in uniform flow. Finally, the local rms lateral force coefficients acting on the localheight of the wind turbine tower increased at the tip speed ratio of 3. The cause is regarded by thefrequency of vortex shedding corresponded to the blade-passing frequency.
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