かく乱を受けたd形粗面境界層の非平衡挙動 : 第1報,平均流特性

概要

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The relaxation process to the equilibrium state for the d-type rough-wall boundary layer disturbed by a circular rod was investigated experimentally. The cylinder was positioned at two distances of y_c/δ_0=0.14 (inner layer) and 0.92 (outer layer). From the results, the mean velocity profile disturbed by the cylinder virtually recovered over a shorter distance for y_c/δ_0= 0.14 than that for y_c/δ_0=0.92. At the measuring station farthest downstream (x/δ_0=82.6), the mean velocity profile differed significantly from that of the undisturbed flow for y_c/δ_0=0.92. However, for both cases, the logarithmic law with x=0.41 was observed in the wide-region-of-flow field. The streamwise changes in the boundary layer characteristics, such as the skin friction coefficient, the roughness function and the wake strength determined from the measurements, indicate the different tendencies of the two cases.
一般社団法人日本機械学会の論文
1990-03-25