長方形断面曲がり管内乱流の研究 : 第6報,管内脈動流での助走区間内流れ

概要

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Fluctuation of the boundary layer grown on the end plate of a duct is studied experimentally for two inlet conditions: at the inlet of the curved duct, one is uniform flow which fluctuates in its magnitude sinusoidally and the other is the flow which always has a fully developed duct flow profile but which fluctuates in its magnitude. For both cases, the cross sectional mean velocity. U_m, fluctuates with the Womersley number of 44.3, and the ratio of the amplitude of U_m to its time mean value, U^^-_m, is 0.38 and the Dean number based on U^^-_m is 1.28×10^4. It is found that (1) at the cross section of the duct turning angle of 60°, the fluctuation of the momentum thickness of main flow velocity, U_φ shows fairly good agreement with the 1/n power law but flow fluctuation has a great effect on the distribution of the cross-flow velocity component, U_r, very close to the wall.
社団法人日本機械学会の論文
1989-03-25