이공학편 : 회전 및 무회전 축구공 주위 유동가시화 풍동실험 연구 = A Flow Visualization Study of the Flowfield around Spinning and Non-spinning Soccer Ball

다국어 초록 (Multilingual Abstract)

The flow visualization was conducted to reveal the reason of the trajectory difference between spinning and non-spinning soccer ball. In this work, the smoke-wire visualization and smoke-tube method were applied to the flow around the real soccer ball installed in the test section of the wind tunnel. In conclusion, the spinning ball proceeds in a certain direction depending on the rotating direction by the Magnus effect. And, the proceeding trajectory of non-spinning ball becomes irregular because of the Kelvin-Helmholtz instability, periodic vortex shedding under a certain condition.