Abstract
A wind turbine operates in turbulent natural wind. In particular, the unsteadiness and turbulence of wind in japan are stronger than one of western countries - Europe, America and others in general. Therefore, we should take account of the unsteadiness of natural wind in installed open-air location for designing a rotor blade in order to make higher performance. The present paper describes the effects of sinusoidally velocity fluctuation, turbulent intensity and vortex scale of simulated natural wind on performance of a horizontal axis wind turbine (HAWT). Using five wind turbine rotors on the basis of NACA and MEL blades, experimental results are mainly presented to demonstrate the dependency of wind frequency, turbulent intensity of the wind. As the results, we succeed that one of our designed MEL-type rotors indicates 130% power coefficient as large as one of steady wind in simulated natural wind.
