Optimum Design Method of Horizontal-axis Wind Turbine Blades Based on Lifting-line Theory

概要

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A design method of horizotal-axis wind turbines is presented, which is based on the lifting-line theory. †The design theory has two themes ; one is to obtain the circulation distribution of the minimum energy lost for a given output power, the other is to determine the expanded profiles and the pitch curve of a wind turbine blade for a given circulation distribution. The Goldstein function can be applied to the former theme. Kramer's diagram for two-bladed, three-bladed and four-bladed wind turbines are represented by means of the Goldstein function. Applying the present method, wind turbine blades are designed and their profiles are investigated. Furthermore, the performance of a two-bladed wind turbine is obtained by the experiments and compared with the numerical result calculated by the lifting-line theory considering viscous effects. It is concluded that the present design method is applicable to horizontal-axis turbines.
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