Abstract
In recent years, size of the wind turbine has progressed in order to reduce energy costs. If further larger size of wind turbine is advanced, rather than the three blades wind turbine, two bladed wind turbine may become cost-effective. But load fluctuation of two-bladed wind turbine in a transient state, such as extreme wind direction change of inflow, has not been revealed. Therefore, in order to experimentally investigate the load fluctuation of two-bladed wind turbine for extreme wind direction change, the extreme wind direction change defined by IEC 61400-1 was caused, and the load fluctuation of two-bladed wind turbine for extreme wind direction change was measured using 6-component balance. This paper showed that without any specific transition for extreme wind direction change, the fluctuation of the mean value of thrust coefficient during extreme wind direction change was based on the thrust coefficient measured in each yaw misalignment angle in the steady inflow experiment.
