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TRANSITION OF WAVE PACKETS ORIGINATING FROM LOCALIZED STRONG DISTURBANCES IN LAMINAR BOUNDARY-LAYER OF ROTATING-DISK FLOW

Akira Nishizawa
Fluid Science Research Center, NAL (JST) 7-44-1 Jindaiji-higashimachi, Chofu, Tokyo 182-8522, Japan

Shohei Takagi
Fluid Science Research Center, NAL

Naoko Tokugawa
Fluid Science Research Center, NAL

Abstrakt

A laminar to turbulent transition process for a three-dimensional boundary layer in a rotating-disk flow initiated by localized disturbances was experimentally investigated. The hot-wire analysis showed that the point disturbance develops into a turbulent patch. The turbulent patch propagating in the wedge region is accompanied by two families of traveling waves, which consist of the so-called cross-flow and streamline-curvature modes. The configuration in the plane view of the turbulent patch is a crescent, which is different from an arrowhead-shaped turbulent spot in a Blasius boundary layer.