E122 回転円盤流中に導入された強い撹乱に伴う不安定波の観察

概要

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A laminar to turbulent transition process of a three-dimensional boundary layer in rotating-disk flow initiated by localized disturbances was experimentally investigated by a single hot-wire probe in the laboratory frame. The hot-wire analyses showed that the point disturbance develops into an isolated turbulent patch accompanied by different types of traveling waves. Comparison with the prediction by Itoh's linear stability theory enabled us the identification of these waves; the streamline-curvature (S-C) instability wave with the larger wavelength and higher frequency passes through the constant radius line prior to the cross-flow (C-F) instability wave with the smaller wavelength and lower frequency. Such characteristic features of these waves are in good agreement with the theoretical results quantitatively. Although the amplitude of the velocity fluctuation of the C-F instability wave is larger than that of the S-C instability wave at a downstream location observed, which mode is dominant for the breakdown into turbulence still remains unclear.
日本流体力学会の論文
2001-07-31