水平軸型風車に対する縦渦を利用した揚力増加技術の開発

抄録

The effect of the lift force of an upstream airfoil used in the horizontal axis wind turbine in set of a cruciform downstream flat plate was examined by using experiments and numerical simulations. In the wind tunnel experiments, it was clarified that the lift force acting on the airfoil increases depending on the angle of attack of the airfoil and the distance from the flat plate. The analysis of the flow field revealed that at the angle of attack of the airfoil where separating occurs from the leading edge, reattachment is induced by sucking the flow separated by the Necklace vortex formed on the upper surface of the airfoil. In an experiment in which the ring plate was installed behind the small horizontal axis wind turbine, it was confirmed that the power coefficient increased when tip speed ratio was small.