Experimental Study of Improved HAWT Performance in Simulated Natural Wind with Fluctuating Velocity using an Active Controlled Multi-fan Wind Tunnel

摘要

The unsteadiness and turbulence of wind in Japan are stronger than one of western c ountries-Europe, America and others in general.Therefore, one should take account of the velocity unsteadiness of natural wind in installed open-air location for designing a rotor blade in order to make higher performance.The present paper mainly investigates the effects of turbulent intensity and vortex scale of simulated natural wind on performance of a horizontal axis wind turbine (HAWT).Using the originally designed five wind turbine rotors on the basis of NACA and MEL blades, experimental results are presented to demonstrate the dependencies of the wind frequency, turbulent intensity and vortex scale of the simulated natural wind.As the results, the power coefficient in the simulated natural wind is 130％ larger than one in steady wind by the designed MEL3-type rotor.