Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 11, 2022 - September 14, 2022
Characteristics of hair-pin vortex shedding from axisymmetric bodies, such as a sphere and a circular disk, were investigated by flow visualization. The wakes behind a sphere and a circular disk at Re = 650, 800 were visualized by water tunnel experiment with fluorescence dye. The hair-pin vortex was continuously separated from the axisymmetric bodies. However, the orientation of hair-pin vortex shedding in various mode was depended on the Reynolds number. In this study, the azimuthal angle of the head of hair-pin vortex were observed from downstream direction. In the case of the sphere wake, the azimuthal angle of the hair-pin vortex was almost constant direction of 270 degree at Re = 650. The angle was gradually scattered at Re = 650. For the circular disk, it was found that the shedding angle of the hairpin vortex was more unstable as the Reynolds number increased than the case of sphere.
