サッカーボール表面の溝の幅と深さが空力特性に与える影響

抄録

The purpose at this study is to clarify the influence of aerodynamic characteristics for various groove shape of soccer balls by a wind tunnel experiments. The width and the depth of the groove of ball surface were changed. Drag coefficient was measured in the range of Reynolds number 0.6×10⁵~3.6×10⁵. As a result of experiment, it was revealed that a critical region changed to the low Reynolds number and the drag coefficient in the super critical region increase as a groove depth is deep. The drag coefficient in the super critical region increase as the groove volume increases.