異なる流路アスペクト比を持つ矩形断面往復流路内乱流の流動特性 : PODによる解析(流体工学,流体機械)

概要

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The experimental study for flow characteristics in the rectangular channels with a sharp 180-deg turn was conducted. PIV measurements were performed both in symmetry plane and in four cross-section planes after the turn for three aspect ratios, AR=1, 2, and 4, at a Reynolds number of 2.0×10^4. Proper orthogonal decomposition (POD), which decomposes a field of a time-dependent variable into an orthogonal set of deterministic functions, was demonstrated on the PIV snapshots to identify coherent structures in the flow. Based on the data, the influence of the channel aspect ratio on flow characteristics in the channel is discussed in detail. The unsteadiness of the longitudinal vortices generated in the cross sectional planes after the turn are also investigated.
社団法人日本機械学会の論文
2005-03-25