Abstract
It is known that the dimple number of the golf ball influences on flying characteristics. The purpose of this study is to clarify the flying characteristics for the number of the dimples and the depths of the unrotational ball. The drag and the pressure acting on golf ball of number of dimples and the depths were measured. As a result, it was clarified that the characteristics of drag is related to the separation point and the wake aria. And flow around the golf ball at subcritical and supercritical is visualized by means of the spark tracing method and the oil film method.In the experiment, diameter of the ball is 42.6mm, the ball which has 104-504 dimples are set on the surface of the ball, and Reynolds number is 4.23×104-1.69×105.(using wind velocity range 15m/s-60m/s).
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