長軸周りに回転するバドミントンシャトルコックの空力特性

抄録

Flying badminton shuttlecocks automatically rotate counter-clockwise (forward rotation) about the major axis as viewed from downstream because of a skirt structure having a diverging array of stems with overlapping feathers. The badminton shuttlecock is known that it has high deceleration characteristics and a high aerodynamic stability. The effect of spin rate on aerodynamic drag of the shuttlecock has not been clarified yet. The aim of this study is to investigate the effect of spin on the aerodynamic characteristics of a shuttlecock. The wind tunnel experiments were performed using YONEX feather shuttlecock (NEW OFFICIAL, No.4, YONEX Co. Ltd.) in a low-turbulence wind tunnel. The fluid force measurements and smoke flow visualization were conducted by changing the rotational speed and the rotational direction of a shuttlecock using a DC motor. During revers rotation, the drag coefficient increases with increasing the spin speed. The drag for the shuttlecock with spin is affected by rotational direction.