Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
The study aims to remove the motor to rotate the cylindrical blade which generates the power of the vertical axis type Magnus wind turbine. The driving force is the Magnus force generated by rotating cylindrical blades. In this field Challenergy is now a leading company and has improved power generation efficiency by attaching a flat plate behind a cylindrical wing. Our previous research confirmed the effect of the plate last year. The research also found out two countermeasures to improve power generation efficiency. One is to install protection plates at both ends of the circular cylinder blades to suppress wingtip vortices, and the other is to attach a curved wing behind a cylindrical blade. However, since the present windmill consumes the electric power to rotate the cylindrical blade, this now results in a major cause of lowering the power generation efficiency. Therefore, in this research, we have developed vertical axis type Magnus wind turbine which does not require any power by optimizing the shape of cylindrical blade. The wind tunnel experiment showed that the net power generation of the windmill can be achieved only under the limited condition, taking the power consumption of the motor into consideration. The experimental test found that the turbo sail type is the most effective of several models in removing the motor to rotate the cylindrical blade. CFD analysis clarified the mechanism that the turbo sail type is able to improve power generation efficiency.
