長平板背後の渦構造に及ぼすスプリッター板の影響(流体工学,流体機械)

概要

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An experimental investigation has been made on the vortex structure behind a long flat plate with a blunt trailing edge. The flow was controlled by an additional splitter plate attached to the trailing edge along the wake center line. The length of the splitter plate, l, was varied from a half to five times the trailing edge thickness, h. Measurements of vortex shedding frequency and of fluctuating velocity and pressure distributions were made in the vortex formation region under the freestream zero pressure gradient. Without splitter plate (l/h=0), the remarkable difference of Strouhal number, S, between for the long flat plate and for the short flat plate, has arisen. A maximum value of the Strouhal number was achieved at the splitter plate length of l/h=1.5, which is the same size for the short flat plate, attached to the long flat plate. The vortex strength expressed by the minimum pressure value on the wake center line, showed a tendency for vortex formation to be suppressed with the splitter plate of l/h≧1, which gave the same trend for the base pressure distribution. The vortex formation length, shear layer thickness, and the reattachment length have been discussed in connection with the vortex shedding.
2007-05-25