A study on an experiment of behavior of a SPAR type offshore wind turbine considering rotation of wind turbine blades

Abstract

Many From environmental problem such as the global warming, the time to utilize renewable energy is ripe in substitution for fossil fuel now. The marine space is a treasure house of renewable energy of various forms. In Japan holding EEZ more than 10 times of the national land, the inflection of the renewable energy is extremely important from the viewpoint of self-supply of the energy. Above all, wind-generated electricity is success of the large-scale industrialization in Europe, and the introduction is examined positively in Japan. However, in the sea near Japan and Japanese EEZ, there is little shallow for a good distance from the shore sea area where large-scale industrialization was made in Europe. Therefore, in the expansion of the offshore wind-generated electricity in Japan, expansion of the offshore wind-generated electricity facility which is available for the very deep waters is necessary. In this paper, we examine a SPAR type wind-generated electricity facility as the wind-generated electricity system which we can install in the very deep sea area. Because the SPAR type wind-generated electricity facility is a slim institution, it is thought that the moorings which are necessary for setting relatively decrease. In addition, in the windmill, that an inclination vibrates is expected gently in actual sea area by the characteristic of the shape because the stability for the inclination is relatively small. It is thought that the Yaw motion of windmill surface is caused by this inclination oscillation and gyro moment by the rotation of the windmill. Therefore, by this research, we show a water tank experiment and numerical computation about interaction between the rotary motion of the windmill blade and the dynamic motion of the SPAR type wind-generated electricity system in waves. In addition, we perform examination about the safety based on those results.