1542 無回転サッカーボールに働く非定常空気力に関する実験的研究(S31 スポーツ流体工学,S31 スポーツ流体工学)

概要

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When a soccer ball is kicked with no spin, its flight trajectory sometimes fluctuates. This phenomenon is called knuckle effect in soccer. In order to investigate the knuckle effect in soccer, we carried out wind tunnel tests of a non-spinning soccer ball. This paper describes the aerodynamic characteristics of a non-spinning soccer ball. It has been found that there are four velocity regions. The first region occurs at less than the critical Re, in which the aerodynamic forces are very stable. The second region is around the critical Re, in which the lift and the side forces oscillate. The third region is between just above the critical Re and 25m・s^<-1>, in which the aerodynamic forces are stable. The forth region occurs above 25m・s^<-1>, in which all aerodynamic forces oscillate markedly.
社団法人日本機械学会の論文
2007-09-07