三次元画像処理流速計による二次元チャネル乱流の乱流統計量の測定

概要

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A fully developed two-dimensional turbulent channel flow has been measured with the aid of the three-dimensional particle tracking velocimeter developed by Nishino et al.(1989). This technique can measure an instantaneous distribution of three-dimensional velocity vectors over a large extent of the flow field. By processing about 48000 TV frames, a total of 4.37 million velocity vectors were obtained. This sufficiently large sample size allowed calculating various turbulence statistics, which include mean velocities, Reynolds normal and shear stresses, triple velocity correlations, skewness/flatness factors of the velocity fluctuations and those of the Reynolds shear stresses. The present results show good agreement with those of the direct numerical simulation by Kim et al.(1987) although some differences are found in the near-wall skewness/flatness factors of the wall-normal velocity fluctuation as well as those of the Reynolds shear stresses. In contrast to these results, the well-known data measured by Eckelmann (1973) and Kreplin and Eckelmann (1979) with the hot-film probes show considerable discrepancies even in the fundamental turbulence statistics in the near-wall region.
社団法人日本機械学会の論文
1990-05-25