AN EXPERIMENTAL STUDY OF RIBBON TYPE WIND TURBINE IN A RING WITH A FLANGE AT THE REAR EDGE

Abstract

Characteristics of ribbon type wind turbine were investigated by wind tunnel experiments. In the ring with a flange at the rear end, the wind turbine power increased. This increase was remarkable when the flange diameter was large. The power coefficient due to the swept area based on the flange decreased as the flange became larger. With the large flange, wind speed reduction effect in the wake was observed in a wide range. Small flange gave lower wind speed around the turbine center. Tip speed ratio hardly affected the wind speed reduction effect.