A312 軟式野球ボールの表面構造に対する空力特性

抄録

This paper describes the aerodynamics characteristic to surface structure in ball.
This study is a basic research for optimum design of surface structure of the rubber-ball used in baseball. The ball of 7kinds of surface structure such as smooth sphere, ball with the seam, and ball with dimple and seam are used for the experiment. Drag and lift coefficients were measured in uniform flow in the Reynolds number range of 0.5×10⁵-2.3×10⁵, in the angle ran from 0-90° at 10° intervals and ball rotation number of and 0, 1000-3500[rpm] at 250 [rpm] intervals. It is clarified that characteristics of drag concerned with separation from the visualization results by means of spark tracing method.
From these experimental results, the relation between aerodynamic lift and drag for surface structure of the ball were clarified.