Host: Science Council of Japan
Co-host: Architectural Institute of Japan, Japan Association for Wind Engineering, The Institute of Electrical Engineering of Japan, Japanese Society of Steel Construction, Japanese Society of Civil Engineering, Meteorological Society of Japan
Pages 000053
In this paper we describe the characteristics of wind forces acting on a propeller-type wind turbine with three blades. The wind forces were investigated using wind tunnel tests. The test parameters were 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 mean drag coefficients acting on the stationary wind turbine at a position where one blade corresponded to 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, and as the pitch angle decreased. The mean drag coefficients in the uniform turbulent flow were larger than those in uniform flow. Finally, the local rms lateral force coefficients acting on the local height of the wind turbine tower increased at the tip speed ratio of 3. The cause is regarded by the frequency of vortex shedding corresponded to the blade-passing frequency.
