回転しているバドミントンシャトルコックの空力特性

（水鳥製公式シャトルコックとナイロン製シャトルコックの比較）

抄録

Various sports are enjoyed in the world. A unique type of ball, which is called a shuttlecock, is used in badminton. It is known that the shuttlecock is the fastest in compared to balls used in the other sports. Furthermore, shuttlecock has high air-friction properties and therefore slows quickly due to its special shapes. In sports, the fluid dynamics in ball movement are very important in the development of sports. Thus, many studies on the aerodynamic characteristics of these balls have been carried out. However, the effects of badminton shuttlecock with rotation on aerodynamic characteristics are still unknown. In this paper, the effects of a feather shuttlecock and a nylon shuttlecock with rotation on the aerodynamic characteristics are investigated by using a wind tunnel. The pressure at the shuttlecock cork tip and slip stream is measured. Flow visualization are carried out by using smoke wire method. From results of the pressure measurement, the shuttlecock pressure coefficient at slip stream of a standard shuttlecock is higher than that of a shuttlecock without slots. From the smoke wire method, the slip stream of the "standard shuttlecock" confirmed that a slip stream domain is big as compared with “without slots”.