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Stereo three-dimensional particle image velocimetry measurement and aerodynamic force analysis of non-spinning soccer balls
Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology ( IF 1.5 ) Pub Date : 2020-02-12 , DOI: 10.1177/1754337119898355
Masaki Hiratsuka 1 , Shinichiro Ito 1 , Keita Miyasaka 1 , Akihisa Konno 1
Affiliation  

A knuckle shot, resulting from non-spinning kicking, is an essential technique in soccer. The irregular flight path of the knuckle shot is caused by the aerodynamic force from the three-dimensional twin vortices generated in the wake behind the ball. However, the detailed behavior of the twin vortices and relation between the jet flow and the acting forces on the balls is still not understood. In addition, a more thorough understanding of the effect of ball panels on the formation of twin vortices and jet flow is important to develop balls with high controllability. To study the effect of the ball panel shape on the flight path, stereo three-dimensional particle image velocimetry wake flow measurements and synchronized force measurements were performed on various soccer balls. It was confirmed that the aerodynamic force on the ball is produced by the jet flow generated by the vortices in the wake flow. The directions of the force followed the changes of the jet flow, and the magnitude of the force was strongly associated with the flow rate of the jet. Moreover, the shape of the ball panels, especially the groove volume, determines the critical Reynolds number and the fluttering of the balls.

中文翻译:

非旋转足球立体三维粒子图像测速测量及气动力分析

由非旋转踢球产生的指关节射门是足球中的一项基本技术。指关节击球的不规则飞行路径是由球背后尾流产生的三维双涡流产生的空气动力造成的。然而,双涡流的详细行为以及射流与作用在球上的力之间的关系仍不清楚。此外,更深入地了解球板对双涡流和射流形成的影响对于开发具有高可控性的球很重要。为了研究球板形状对飞行路径的影响,对各种足球进行了立体三维粒子图像测速尾流测量和同步力测量。证实了球上的空气动力是由尾流中的涡流产生的射流产生的。力的方向随着射流的变化而变化,力的大小与射流的流速密切相关。此外,球板的形状,尤其是凹槽体积,决定了临界雷诺数和球的颤动。
更新日期:2020-02-12
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