軸対称形渦流崩壌における渦塊の形成過程とその構造 : 第3報,非定常境界条件と形成過程に関する実験

概要

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This study investigates the growing process of an axisymmetric (bubble type) vortex break-down. In the preceding reports, the growing process of the bubble was discussed, based on the inviscid linear theory of the internal wave, and also examined by the numerical analysis of the Navier-Stokes equations. In this paper, experiments of the unsteady swirling pipe flow is conducted to confirm the theoretical results concerning the growing process. Generation of a group of internal wave by the abrupt change of the upstream boundary condition, its propagation and dispersion are measured by a Laser-Doppler-Velocimeter, and obtained data are compared with the results of inviscid theory. By the method of intermittent or periodic injection of dye, the growing process of a bubble is clearly visualized. The obtained results of the growing process showed a good agreement with the theory.
社団法人日本機械学会の論文
1988-01-25