円柱表面速度境界層計測に特化した熱線流速計プローブの開発

抄録

　　　The boundary layer and velocity shear layer that develop around a circular cylinder placed in a flow have a significant effect on lift and drag depending on whether it is laminar or turbulent. These shear layers are so thin that special measures are required for the experiment. In this study, a specially shaped probe was developed to measure the boundary layer using a hot-wire anemometer. An experiment was performed using with that probe at Re = 1.6×10⁴. As a result, the velocity distribution and the velocity fluctuation distribution of the extremely thin boundary layer of 0.5 mm were measured. The frequency analysis showed that the separated laminar shear layer transitioned to turbulent flow near the boundary with the separated region.