正方形管内流の乱れ強さと乱れの確率密度分布 (新編集方針に基づく論文)

概要

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The turbulent velocity components and their probability density distributions were measured throughout the cross-sectional area in the fully developed turbulent flow through a square duct at Re≒7000 using LDV. The purpose of this work was to obtain data of value to engineers interested in the testing of a turbulent flow simulation model on a complicated flow pattern under a simple boundary condition. At this Reynolds number, the measured profiles of turbulent intensity near the wall bisector were in good agreement with Kim et al.'s results of direct numerical simulation on the two-dimensional channel flow. For higher moments of turbulent velocity such as a skewness factor and a flatness factor, this agreement tends to be confined to the region adjecent to a wall. The flow field affected by the side wall was specified and the aspects of probability density of turbulence in this region were made clear through the measurements. Also, the velocity vector diagram of secondary flow was obtained. These results will contribute to a comprehension of turbulent flow in a square duct.
一般社団法人日本機械学会の論文
1991-10-25