A-31 ジャイロボールにおける異なる縫い目位置での剥離の効果(野球2(FD))

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  • A-31 Effect of separated regions with different seam positions on Gyro-ball
  • ジャイロボールにおける異なる縫い目位置での剥離の効果
  • ジャイロボール ニ オケル コトナル ヌイメ イチ デ ノ ハクリ ノ コウカ

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The purpose of this study was to observe separated regions around a rotating baseball in a wind tunnel and to clarify the influence of seam positions. First of all, the rotational-ball supporting device was developed, and it was set in the wind tunnel. Then, the drag forces of 2-seam and 4-seam gyro-ball were measured. It was found that the drag coefficient of 2-seam gyro-ball was smaller than 4-seam one by 0. Based on this result, smoke visualization was used to obtain the flow pattern around the gyro-balls with high-speed camera. As a result, the separated regions of 2-seam gyro-ball were smaller than that of the 4 seam one.

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