放射状液膜流れの乱流くさび周辺の層流域で成長する斜行トルミーン・シュリヒティング波について(流体工学,流体機械)

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This paper describes the formation and development of oblique Tollmien-Schlichting waves around a turbulent wedge in a radial liquid film flow. The liquid film flow was formed of water discharged to the atmosphere from a narrow gap between the end of a vertical cylindrical pipe and the surface of a horizontally placed disk. The turbulent wedge was generated artificially in the laminar region of the liquid film flow by two kinds of introduction of local turbulence : an isolated roughness element and a jet injection. Oblique T-S waves around the turbulent wedge were observed carefully by means of high-speed photography. In addition to the observation, downstream development of T-S wave produced by the local turbulence was simulated on the basis of a linear stability theory. The wave length and phase velocity of the oblique T-S wave and the manner of development of the oblique T-S wave observed experimentally were in good agreement with the simulation. This indicates that the oblique T-S waves around the turbulent wedge were not produced by the turbulence of the turbulent wedge, but produced by the local disturbance induced by the roughness element or the injection jet
一般社団法人日本機械学会の論文
2007-06-25