層流境界層の中にある垂直平板後方に形成されるアーチ形渦

概要

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Characteristics of arch-type vortex formed behind a plate of aspect ratio h/w = 0.8 (h: hight, w: width) which is placed vertically in a laminar boundary layer had been investigated. Flow visualization and analysis on velocity signals yielded following some new under standings. (i) The variation of Strouhal number S_t (=f_cw/U_0) with Reynolds number R_e (=wU_0/v) can be classified into three regions. (ii) Arch-type vortex formed behind a plate shows inconsistency in its periodicity and strength, and have no regular mode vortex shedding like two-dimensional circular cylinders. (iii) Different tendency of Strouhal number distribution for Reynolds number is due to the different time rate of intermittent vortex shedding. (iv) Arch-type vortex formed behind a plate starts to dissipate in the very vicinity of the downstream of the plate before convected to far downstream.
一般社団法人日本機械学会の論文
1986-01-25