Host: Japan Association for Wind Engineering
Pages 113-
In order to improve efficiency and safety, a wind-turbine power generator includes a blade pitch angle and yawing control function. Various control methods have been proposed, among others there is the control method which has a condition of the trailing edge into the wind for reducing extreme loads. Recently the size of wind-turbine power generator is getting larger, the use of such control method is expected to increase further in the future. However, there has been little report on aerodynamic characteristics of blade at angle of attack around 180°.
In this study, we carried out a spring supported test by using two-dimensional model. This report describes a dynamic characteristic of two blades (NACA0012, NB18 which is asymmetrical blade) at angle of attack 172°,180°, and 188°. These results showed some differences in the presence of flutter and the critical wind speed. Moreover, the distinguishing characteristic was obtained in case of NACA0012 at angle of attack of 180° when the single degree of freedom system was used.
