Abstract
Recently, drains of fossil fuel and the increase of the amount of CO_2 discharge are fatal issues for earth environment. Wind turbine with brimmed diffuser has the power generation efficiency of 4 times as high as the conventional wind turbine. The accidents of wind turbine with brimmed diffuser were caused for several times. However, there are no researchers on the fatigue strength and the fatigue life of the new wind turbine. Then, the purpose of the study is to estimate the fatigue strength and the fatigue life of the wind turbine with brimmed diffuser. The service strain of blades with the variation of wind velocity and wind direction was measured by wireless strain measurement system. The results show that the higher the variation ratio of the wind velocity and the wind direction are, the larger strain variation of the wind turbine blades. In addition, fatigue life based on the modified Miner rule was estimated by the strain data. The fatigue life of the wind turbine blades was five years estimated on the base of the strain data at the wind tunnel equipment.
