EXPERIMENTAL ANALYSIS ON FLOW AROUND A CIRCULAR AND AN ELLIPTIC HOOP-TYPED RING BY USING A PIV TECHNIQUE

Abstract

In the present study, we measured velocity vector fields around hoop rings at each divided sections by using a particle image velocimetry method. The ring model used in this study was made of brass with two different aspect ratios and the experiment is carried out in a circulating water channel. As a result, we can observe two counter-rotating vortical flow structures around each hoop regime that is attributed to the interaction between direct pass through flow of hoop center and the shear flow separated from sharp-edged end of ring hoop.