S0506-1-3 野球ボールのSeam構造変化に対する空力特性(スポーツ流体工学(1))

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This paper describes on aerodynamic design of surface structure of the rubber ball. The surface of the rubber ball has linear trapezoidal projections that are similar to the seam of a normal baseball, and the surface is covered by elliptical and circular dimples similar to those of golf ball. However, the dimples on rubber ball are due to the industrial design, and their effect has not been examined from the viewpoint of aerodynamic characteristics. The aim of the present research is to investigate the aerodynamic characteristics associated with the surface design of rubber baseballs. In this study, the aerodynamic characteristic(lift coefficient, drag coefficient) for the shape change (trapezoid type, arc type, triangle type) of the seam conducted to the rubber ball surface within Reynolds number Re=0.5〜2.6×10^5, N=0〜3500rpm rotational frequency has been clarified,
社団法人日本機械学会の論文
2009-09-12