Aerodynamic Characteristics of New Volleyball for the 2020 Tokyo Olympics
Aerodynamic Characteristics of New Volleyball for the 2020 Tokyo Olympics
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DOI：
10.3390/app10093256
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发表时间：
2020-05-01
影响因子：
2.7
通讯作者：
Asai, Takeshi
中科院分区：
文献类型：
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作者：
Hong, Sungchan;Ozaki, Hiroki;Asai, Takeshi
现代排球的图案与传统排球有很大的不同，球表面的形状和设计发生了一些变化。此外，在2020年东京奥运会上，一种带有18个面板的新排球（V200 W;米卡萨）将作为官方用球展出。因此，本研究在风洞中比较了传统排球与新设计排球的基本空气动力学特性。我们使用三个全尺寸的FIVB（国际排球联合会）官方排球（V5 M5000; Molten，MVA 200;米卡萨和V200 W;米卡萨）来确定作用在每个球上的空气动力。结果表明，临界雷诺数（Re-cr）的不同取决于球的类型和它们的取向。熔融球（常规）的Re-cr经测定在面板方向A上类似于3.4 x 10（5）（Cd = 0.17），在面板方向B上类似于2.7 x 10（5）（Cd = 0.14）。此外，常规米卡萨球的Re-cr在板方向A上被确定为类似于2.6 x 10（5）（Cd = 0.14），在板方向B上被确定为类似于3.0 x 10（5）（Cd = 0.13）。另一方面，新型排球（V200 W）的临界雷诺数在板方向A上类似于2.9 x 10（5）（Cd = 0.17），在板方向B上类似于2.6 x 10（5）（Cd = 0.15）。根据这些结果，可以假设，在浮动发球过程中，飞行轨迹将根据排球的类型和方向而变化。
The pattern of a modern volleyball is greatly different from that of a conventional volleyball, with several changes being made to the shape and design of the surface on the ball. Furthermore, at the 2020 Tokyo Olympics, a new volleyball (V200W; Mikasa) with 18 panels will be shown as the official ball. Therefore, this study compared the basic aerodynamic characteristics of conventional volleyballs with those of new designs in a wind tunnel. We used three full-size FIVB (Federation Internationale de Volley-Ball) official volleyballs (V5M5000; Molten, MVA200; Mikasa and V200W; Mikasa) to determine the aerodynamic forces acting on each ball. The results indicate that the critical Reynolds number (Re-cr) differed depending on the ball types and their orientations. The Re-cr for the Molten ball (conventional) was determined to be similar to 3.4 x 10(5) (Cd = 0.17) on panel orientation A and similar to 2.7 x 10(5) (Cd = 0.14) on panel orientation B. Moreover, the Re-cr for the conventional Mikasa ball was determined to be similar to 2.6 x 10(5) (Cd = 0.14) on panel orientation A and similar to 3.0 x 10(5) (Cd = 0.13) on panel orientation B. On the other hand, the critical Reynolds number for the new volleyball (V200W) was similar to 2.9 x 10(5) (Cd = 0.17) in the panel orientation A and similar to 2.6 x 10(5) (Cd = 0.15) in panel orientation B. From these results, it can be hypothesized that, during a float serve, the flight trajectory will change depending on the type of volleyball and their orientation.