平面壁上の正方形状突起群まわりの流れ〔流体工学, 流体機械〕

概要

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We describe the experimental study of the flow structure past repeated three-dimensional ribs of a square section on a ground plate for various values of spacing ratio S/H. Test ribs of the square section with side length D=23mm and height H=5 mm were aligned at a regular pitch in a square array and in a staggered array, and the spacing between the two adjoining ribs was varied at S/H=2,3,5,7,10,13 and ∞ (i.e., a single rib). The time-mean velocity and turbulence intensity were measured using the laser-Doppler velocimeter. As a result, for the case of the square array, there were two flow patterns in the groove. A large recirculation region occupied the entire groove between two adjoining ribs without reattachment for S/H≦5. However, the free streamline leaving the upstream rib enclosed the recirculation region and reattached the ground plate for S/H≧7. On the other hand, a flow pattern independent of S/H was found for the staggered array, which corresponded to the flow pattern for S/H>7 in the square array.
一般社団法人日本機械学会の論文
1997-12-25