縦渦駆動円柱翼風車における後流リング平板の形状因子に関する検討

抄録

The lift force of the cylinder blade wind turbine driven by longitudinal vortex improves with an increase in blade diameter d and ring plate width W, but existing wind turbine systems don't account for the differences that arise when transitioning from a cylinder parallel movement system to a cylinder rotation system. Therefore, this study aims to clarify the effect of ring curvature and propose performance prediction indicators based on representative geometric parameters. The lift force is evaluated through wind tunnel experiments by varying the ring plate diameter D in arbitrary combinations of d and W. As D decreases or W increases, the difference in rotational speed between the inside and outside of the blades within the ring should increase, causing the rotational speed of the wind turbine to relatively rise. However, it was found that when D becomes smaller than a certain value, the rotational speed decreases to balance with the form drag of the blades. It was found that when D increases and the longitudinal vortex generation region approaches the blade tip, the slope of the torque curve decreases at low rotational speeds. By mapping these results, it became possible to estimate performance based on geometric parameters.