長方形断面柱をおいた平行平板間流れの乱流構造〔流体工学, 流体機械〕

概要

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An experimental study was made in a channel flow with a rectangular cylinder having the various width-to-height ratio, b/h, of 0.5,1,2 and 3. The unsteady flow past the rectangular cylinder was measured by laser Doppler velocimetry and its characteristics were studied in terms of the phaseaveraged statistics of the periodic and turbulent velocity components as well as the statistical turbulent quantities. Turbulent intensities on the centerline of the channel have their maxima near the rear stagnation point of the recirculation region. Wavelet analysis of the normal velocity component reveals that the periodic velocity fluctuation disappears intermittently for b/h=2. Furthermore, the phase-averaged results using the wavelet analysis show that, in the case of b/h=2,the contribution of the periodic components to the time-averaged statistics is smaller than that of the turbulent components while the former predominate over the latter in the other cases.
社団法人日本機械学会の論文
1998-04-25