円筒容器内の渦崩壊現象に関する実験的研究(流体工学,流体機械)

概要

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A high-quality precision-controlled turntable apparatus was designed to study the dynamic behavior of viscous fluids contained in a cylindrical container. Vortex breakdown produced by a rotating endwall disk was visualized by using a fluorescent dye technique. This flow problem is governed by a combination of two non-dimensional physical parameters, i.e., the height-to-radius ratio H/R and a rotation Reynolds number ΩR^2/ν. Limiting boundaries for first, second and third vortex breakdown bubble in a steady flow were reproduced to compare with the previous visualization studies of Escudier. The domains for the periodic axial oscillation and the precession were represented clearly in an unsteady flow. The experimental results in the steady flow were in excellent agreement with Escudier's results. The location and size of the vortex breakdown bubble were estimated quantitatively in the steady flow. The amplitude and time period of the periodic axial oscillation and the polar angle and time period of the precession in the unsteady flow were also estimated.
一般社団法人日本機械学会の論文
2002-02-25