Flow visualization on a real flight non-spinning and spinning soccer ball
Deutscher übersetzter Titel: | Strömungsvisualisierung eines nicht-rotierenden und eines rotierenden Fussballs bei einem reellen Flug |
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Autor: | Asai, Takeshi; Seo, Kazuya; Kobayashi, Osamu; Sakashita, Reiko |
Erschienen in: | The engineering of sport 6. Volume 1: Developments for sports : Proceedings of the ISEA 2006 - Munich, Germany |
Veröffentlicht: | Wien: Springer (Verlag), 2006, S. 327-332, Lit. |
Forschungseinrichtung: | International Sports Engineering Association |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Sammelwerksbeitrag |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU200809003110 |
Quelle: | BISp |
Abstract
Wind tunnel test with a full size non-spinning soccer ball was carried out to measure the aerodynamic forces (drag, lift and side force). The drag coefficient of a non-spinning soccer ball in the subcritical regime was nearly 0.43 and that of in the supercritical regime was nearly 0.15. It is estimated that the critical Reynolds number of a soccer ball is about 2.2x105. In the visualization experiment using titanium tetrachloride, we compared the flow around the ball during a non-spinning, low-speed kick (5 m/s) and a high-speed kick (29 m/s). During the low-speed kick, the boundary layer separation point was about 90 degrees from the front stagnation point, while during the high-speed kick the separation point had receded to about 120 degrees from the front stagnation point. Verf.-Referat