1202 風洞実験による低回転サッカーボールに作用する非定常空気力の測定(2)(OS12-1 スポーツ流体工学,OS12 スポーツ流体工学,オーガナイズドセッション)

概要

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Less spinning soccer ball aerodynamics are studied by wind tunnel experiments. Aerodynamic forces of unsteady lift and side ones acting on the ball at rest are measured and estimated flight trajectory. Well agreements of flight shift magnitude in lateral direction between observed and calculated ones are obtained. As a result, in this stage the cause of this strange behavior of less spinning soccer ball is clarified by self-excited buffeting phenomenon of irregular behaviors of horseshoe-shaped vortex and longitudinal twin one, which already discovered with supper critical Re number region of smooth sphere by Taneda(1976).
2007-11-17