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An experimental study of baseballs and softballs

机译：棒球和垒球的实验研究

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The primary aim of this study is to experimentally evaluate the effects of seam orientation and angle of attack on aerodynamic drag for a series of commercially manufactured baseballs and softballs used in major tournaments. The aerodynamic forces and moments were measured experimentally over a range of wind speeds and angles of attack at different seam orientations with respect to the wind direction. The results indicate that the seam orientation had profound impact on aerodynamic characteristics of both baseball and softball. The average C_D variation between sides of baseball facing the wind can vary up to 16%. The results also indicate an increase of C_D values with the increase of angle of attack for all balls and seam positions tested.
机译：本研究的主要目的是通过实验评估接缝取向和攻角对主要锦标赛中使用的一系列商业制造的棒球和垒球的空气动力学阻力的影响。在不同的接缝方向上通过在一系列风速和攻击角度上通过实验测量空气动力和矩。结果表明，接缝取向对棒球和垒球的空气动力学特征产生了深远的影响。面向风的棒球侧面之间的平均C_D变化可以变化高达16％。结果还表明C_D值随着所有球和接缝位置的攻角增加而增加。

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