Abstract
By applying an inverse tapered blade to a small wind turbine, it is shown clearly experimentally that the performance at a low rotational speed region improves. However, the details of the performance improvement mechanism are not clear. The purpose of this research is to clarify the performance and flow field of two kinds of horizontal-axis propeller type wind turbines having different rotor plane shape. Therefore, the rotors which have the tapered blades which become small as chord length goes to a tip, and the inverse tapered blades which become large as it goes to a tip were investigated by numerical analysis. As a result, the following facts became clear. The inverse tapered blade has a power coefficient larger than the tapered blade, and the peak shifts to a low tip speed ratio side.Moreover, the inverse tapered blade has a load larger than the tapered blade at a tip.
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