有限厚さ平板後流における渦転移構造に関する研究

概要

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Wake structures of a flat plate with finite thickness are studied using the rake of X-wires techniques. Parallel and oblique shedding modes in the wake flow are investigated. These modes depend on the flat plate end conditions. In the present paper, we demonstrate that manipulation of the end conditions yields a vortex dislocation that appears periodically at the same location. Vortex linkup dynamics phenomena in the dislocations are observed with smoke-wire flow visualization. Flow patterns of dislocation are analyzed by mean of the pseudo-flow visualization of the rake data. The linkup structure due to a misfit of two oblique shedding vortices appears periodically in the flow patterns. Evolutions of the power spectra of velocity fluctuations explain the generation of large-scale turbulent structure downstream due to the growth of a low-frequency mode and the cascade process of low/high frequency components.
社団法人日本機械学会の論文
2000-09-25