A225 ステレオ PIV による軸対称噴流の 3 次元渦構造の可視化

概要

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Turbulent vortical structures in an axisymmetric free jet were experimentally visualized by using the stereoscopic particle image velocimetry (Stereo-PIV). The initially laminar water jet was formed through a pipe which was set horizontally in a Plexiglass tank. A laser light sheet illuminated a cross sectional plane normal to the axis of the jet and two CCD cameras captured particle images in a same region. Assuming Taylor's frozen hypothesis, the 3D-3C fields of swirling strengthλi were reconstructed from time-dependent 2D-3C velocity data obtained by applying Stereo-PIV algorithm. This 3D visualization revealed that the hairpin type vortical structures and characteristic distribution of mass flow around the vortices were quite evident in the shear layer of the jet.
日本流体力学会の論文
2002-07-23