接缝方向对飞行中旋转棒球的升力和阻力的影响

Joseph Seydel
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引用次数: 0

摘要

自棒球诞生以来,人们一直在研究和争论接缝方向相对于旋转轴对旋转棒球受力的影响。早期的争论主要集中在旋转棒球是否能形成曲线,最终转变为接缝方向是否对球在飞行过程中的受力有影响。这项研究利用计算流体动力学表明,接缝方向对棒球飞行时的升力有很大影响,但当旋转速度接近相同大小球体的自然脱落频率时,这种影响就会减弱。接缝穿过上下表面引起的尾流振荡最终会导致更大规模的不稳定性,接缝方向对作用在球上的力的影响也会显著减小。
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The influence of seam orientation on the lift and drag of a rotating baseball in flight
The effect of seam orientation relative to the spin axis on the forces of a rotating baseball has been studied, and debated, for as long as baseball has existed. Early debates centered on whether a spinning baseball could even curve and eventually changed to whether the orientation of seams had any impact on the forces acting on the ball during flight. This study uses Computational Fluid Dynamics to show that the seam orientation can have a significant influence on the lift force experienced by a baseball in flight, but that influence diminishes as the rate of spin approaches the natural shedding frequency of a sphere of the same size. Oscillations in the wake caused by the passing of seams across the upper and lower surface eventually give way to larger scale instabilities and the impact of seam orientation on the forces acting on the ball is significantly reduced.
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来源期刊
CiteScore
3.50
自引率
20.00%
发文量
51
审稿时长
>12 weeks
期刊介绍: The Journal of Sports Engineering and Technology covers the development of novel sports apparel, footwear, and equipment; and the materials, instrumentation, and processes that make advances in sports possible.
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