Abstract
This report is concerned with results of the systematic experiment which aims to clarify the relation between the behavior of the wake from a circular cylinder within a laminar boundary-layer and the boundary-layer transition. Main results are as follows. The behavior of wake is different according to the gap size, the boundary-layer thickness and the distance from the origin of boundary-layer to the elements, and is classified into-three regions. First, in the region I, no vortex shedding is found and the process of transition is substantially same as the process caused by the roughness elements which is laid on the surface In region II, the periodic laminar vortex shedding is observed to be died out in downstream and the transition process is similar to one in region I. In region III, the regular vortex shedding develops rapidly to turbulent wake and causes the boundary-layer transition.
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