S0502-4-2 Investigation of the flow structure around a baffle in a rectangular open channel by UVP

概要

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The vertical flow structure around a standing baffle in a rectangular open channel has been investigated by an Ultrasonic Velocity Profiler (UVP). Spatial distributions of the time-averaged of vertical velocity components and relative turbulent intensities for vertical components at vertical measuring lines indicate how the flow structure changes from up- to downstream of it. At baffle's upstream they indicate the flow structure of the uprising flow. But behind the baffle indications of vortex shedding and flow separation such as the prominent peak values in the relative turbulent intensity profiles are observed. Spatio-temporal distributions of the vertical velocity at up- and downstream sections confirm the existence of periodic change of flow direction near the baffle edge at its downstream which can be attributed to the vortex shedding. Smoothed space-dependent power spectra indicate the existence of some peak structures near the baffle's edge at its downstream which are corresponding to the periodic nature of flow concentrated mainly near the baffle's edge in the spatio-temporal vertical velocity distributions. Such peak structures could not be observed for the upstream sections.
一般社団法人日本機械学会の論文
2010-09-04