低水路側壁が傾斜した複断面開水路流れにおける二次流れと組織構造の特徴

Abstract

In this study, characteristics of secondary flow and coherent structure in one-sided compound open channel flows with inclined main channel side wall are investigated using PTV (Particle Trucking Velocimetry) and fluorescent dye injection method. The velocity measurement results show that intensity of secondary flow in the case of deep depth tends to be weak compared with the flow with vertical side wall and the rotation of circular secondary flow over the inclined side wall in the case of shallow depth is in the direction opposite to that one of the flow in the case of deep depth and vertical side wall. The results of flow visualization indicate that streamwise vortex is formed over the junction edge, inclined side wall and the corner of the main channel. Furthermore, the analysis of DPTV (Dye-streak pattern Particle Trucking Velocimetry) which is combined with PTV and fluorescent dye injection method shows that the streamwise vortices play important role in generating instantaneous secondary flow.