かく乱を受けたd形粗面境界層の非平衡挙動 : 第2報, 乱流特性

概要

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The variation of turbulence structure and the relaxation process of turbulence quantities to the equilibrium state for the d-type rough wall boundary layer disturbed by a cylinder rod have been investigated experimentally. The rod was positioned at two distances of y_c/δ_0=0.14 (inner layer) and 0.92 (outer layer). The quantities measured are three component turbulent intensities and Reynolds shear stress. From the results, each turbulence quantity of the present rough wall flow disturbed by the rod virtually recovered over a shorter distance for y_c/δ_0=0.14 than that for y_c/δ_0==0.92. For y_c/δ_0=0.92, the turbulent intensities of the three components and the Reynolds shear stress profiles most possibly reach the equilibrium state differed from that of the undisturbed flow at the farthest downstream station. The influence of the disturbance was found to appear as the enlargement of the v component turbulent intensity profile for both cases. The Reynolds shear stress profile exhibited the negative value near y/δ=0.6 in the region of y_c/δ_0≦3.3 for y_c/δ_0=0.92. The relaxation process to the equilibrium flow was examined by evaluating the streamwise variation of turbulent kinetic energy flux.
一般社団法人日本機械学会の論文
1992-01-25