抄録
It is known that low rotating or no-rotating balls have the erratic ball path especially in the recemt soccer balls. Aerodyanamic performance and dynamic velocity distributions of the balls wake were measured by 3 component load cell and dynamic PIV system on five types of different panel balls. As a result, the difference of drag coefficient of each ball was found especially in drag crisis regions. Three-dimensional twins vortices were found in the wake behind every balls. The magnitude of the jet stream velocity between each twin vortices was also found to vary according to the difference of the ball panel.
