E323 平板境界層における層流と乱流の界面構造に関する研究(E-32 乱流渦構造(2),一般講演)

概要

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The structure of laminar-turbulent interface in a flat plate boundary layer is experimentally studied using a single and X-type hotwire probes. The bimorph type piezo ceramic actuator is used to excite the turbulent wedge region in the laminar boundary layer. The structure of the interface is captured by a conditional sampling technique based on energy of the velocity fluctuation at the point where the velocity profiles of the laminar and the turbulent flows cross each other. As a result, it is found that there exists a pair of the longitudinal vortices, aligned in the wall-normal direction, in the near wall region at the interface. It can be assumed that the vortices contribute to the expansion of the turbulence region by inducing velocity outward from the turbulent region.
日本流体力学会の論文
2004-08-09