2524 動的状態を考慮した風車専用翼型の実験的研究(S47-4 自然の流体エネルギー利用技衛(風車2),S47 自然の流体エネルギー利用技術)  [in Japanese] 2524 Experimental studies on the wind turbine airfoils with dynamic state  [in Japanese]

In generally, the two-dimensional airfoil characteristics in the static state are used for the wind turbine blade design. However, the wind turbines are operated in the natural wind with continuously changing in both speed and direction. So, the attack angle of the blade element is fluctuating. Specially, in the inboard section attack angle have big amplitude of fluctuation caused by the yaw misalignment. The airfoil characteristics in the dynamic state are important for the inboard section. In this paper, the airfoil characteristics are investigated experimentally by the surface pressure measurement. Also the dynamic characteristics with sinusoidal pitching motion are measured. As the results, it is found that the dynamic characteristics depend on the amplitude of stall angle. Furthermore, at low Reynolds number the stall angle for wind turbine airfoils is depend in both reading edge radius and suction side curvature.